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Tips to improve mpg?

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Posted on Apr 21, 2012 12:08:02 PM PDT
Last edited by the author on Apr 21, 2012 12:11:13 PM PDT
Jon says:
Fill up with ethanol free gasoline if you can find it. I run it in my smart car and it is getting 50 mpg with 93 e-free gas, about 42 on E10 gas. Also use pure synthetic motor oil, and keep that air filter clean. Losing weight also helps.

Posted on Apr 23, 2012 3:12:27 PM PDT
Mike says:
the only way to improve your mpg is to get a good video converter that converts in mpeg format with a high compression quality

In reply to an earlier post on Apr 23, 2012 4:16:41 PM PDT
Randy says:
Dan , in case you didn't know it. All gasoline has ethanol in it . It was made mandatory back in 2000 or 2001 across the whole USA , so I'm not sure where your getting " pure gas ". I used to haul gas and remember when it was made mandatory by the government that 10% ethanol be added. Actually ethanol known at the pump as E85 for flex fuel cars has higher energy less mpg than just gas alone.

In reply to an earlier post on Apr 23, 2012 4:23:44 PM PDT
JackV says:
Nope, not all gasoline has ethanol in it. Or else I'm being lied to?

In reply to an earlier post on Apr 23, 2012 5:19:26 PM PDT
Dan says:
Not true.. almost all stations use ethanol mixes.. but only because they receive tax subsidies to do so. There are still thousands of stations which offer pure gas.

Visit for a list of stations in your area which have 0% ethanol pumps. It costs more than subsidized ethanol gas, but it may be worth it for the benefits.

Also, there's no way E85 fuel contains higher energy.. gasoline always has higher energy density than ethanol.. the more ethanol in the mix, the less energy you're getting.

Posted on Apr 23, 2012 5:37:39 PM PDT
Gearz says:
Some of the ideas are good like keeping the tires properly inflated and making sure the engine is tuned up but there is one thing out of our control and that is the fuel we all buy, because if it is not high quality all of the maintenance in the world won't produce better fuel mileage. The fact is that a vehicle use less fuel in the fall and spring because of the cool temperatures 50-70 degrees. The other factor is fuel validity witch mean how well the fuel can burn completely and not cause the engine to stall out or ping on acceleration. Buying fuel from a gas stations that are busy means that the fuel is fresher and you have a better chance of getting more for your money. One last thing don't fill up on a hot day because you get less gas than you pay for because of evaporation.

In reply to an earlier post on Apr 23, 2012 6:30:17 PM PDT
Dan says:
A lot of what you just said makes no sense..

first of all, we can control which fuel we buy, like I just said in my post right before yours -- you can buy ethanol-free, pure gas, which is guaranteed to improve your fuel economy.

Vehicles may use less gas when it's colder.. but only because you're less likely to turn on the A/C or roll the windows down (increases drag).

"fuel validity" doesn't make sense. Look up the word 'validity'.. might not mean what you think it means.

And your suggestion to not get gas on a hot day also does not make sense. Any significant evaporation of gas wouldn't occur in between the pump and your tank.. it's ridiculous to say that you're losing money doing that.

In reply to an earlier post on Apr 23, 2012 9:25:29 PM PDT
Gearz says:
Wow how old are you it doesn't sound like you know what your talking about! Ya using the a/c on the highway is better than having the windows down big deal. I am trying to say is that there are other things that can cause poor mileage if you want i could talk about driving habits but that boring. I didn't say colder i said cooler there is a difference.

Posted on Apr 24, 2012 8:08:55 PM PDT
Paul Evans says:
Maybe the word Gearz was intending to use is Volatillity? Winter gas has high volatility, and summer gas has low volatility.

My list of things to do:
-Obviously, try to use the accelerator intelligently - Coasting while there's a red light ahead, etc.
-LRR tires - they're specifically designed to get you better mileage. Definitely worth a look if high performance is not a concern.
-If there is ethanol-free gasoline available near you, use it! I notice a significant mileage jump every time I manage to find an ethanol-free station.
-Keep your engine well-maintained, and use a lower winter-weight, full-synthetic engine oil (going from 5W-30 to 0W-30 got me an MPG or two)
-Keep your car light - Keep as much weight out of the car as possible. You don't need your bowling ball at work... I hope O.o

In reply to an earlier post on Apr 26, 2012 12:51:04 PM PDT
mtxjohn says:
You're half right. Colder, denser air can reduce F/E as engines run more efficiently with a HOT air intake, up to the point where the engine retards timing. More hot air is less dense, forcing the throttle body to be opened more and thus reducing pumping losses at the throttle body. Sometimes CAI are less restictive and can bump FE but bringing in cold, dense air is great for HP but not always FE. Honda Hybrids and special edition cars use a "lean burn" technology which proves that more air is better for FE. (so instead of 14.7:1 its like 22:1 air to fuel)

In reply to an earlier post on Apr 26, 2012 12:54:10 PM PDT
mtxjohn says:
wrong sir. More oxygen ALWAYS means more fuel in modern cars. Unless your talking about an ancient car with carbs and not Fuel injected. The car's system will ensure a constant a/f ratio. As per my above comment a SRI/CAI will only give you better FE because it decreases pumping losses.

In reply to an earlier post on Apr 26, 2012 12:55:26 PM PDT
mtxjohn says:
Yep, thats by design to dehumidify (condition) the air to defog the windows faster as well as run the AC occasionally to keep the AC seals from drying out and the system running properly.

In reply to an earlier post on Apr 26, 2012 12:58:24 PM PDT
mtxjohn says:
Hi Thor, great info on you post. CAI can reduce FE because colder air makes the car run less efficiently. True less restriction will increase efficiency but HOT air will do 2 things: 1 warm the car faster thus giving best MPG faster and 2 hotter, less dense air forces you to step on the throttle a bit more, thus reducing pumping losses at the throttle body.

In reply to an earlier post on Apr 26, 2012 5:01:27 PM PDT
Last edited by the author on Apr 26, 2012 5:02:48 PM PDT
Its not about evaporation Dan its about energy content, wamer fuel has less energy than colder fuel. ( There is more space between the atoms of warmer fuel.) Most fuel pumps are not temperature compensted. When the fuel is pumped on the truck from the refinery it IS tempurature compenstated. The people buying it from the refinery want what they paid for. Thats my 2 cents. Cheers.

In reply to an earlier post on Apr 26, 2012 7:23:03 PM PDT
ac vs windows if you driving slower then 40 open your windows if faster it cheeper to run the ac then the extra drag of open windows and ignore the heat factor as it free as it uses waste heat and the radio is free unless you have a hybrid as alt run all the time

In reply to an earlier post on Apr 26, 2012 10:43:47 PM PDT
Dan says:
Well, that makes more sense. I was just responding specifically to his claim that you're losing money due to evaporation of the gas in the warmer weather.. can't imagine the difference is very significant anyway.

In reply to an earlier post on Apr 26, 2012 10:54:05 PM PDT
Carl G says:
Jack, we've certainly seen this before haven't we. lol

In reply to an earlier post on Apr 27, 2012 10:38:57 AM PDT
About 5% on average. Cheers.

In reply to an earlier post on Apr 27, 2012 12:25:57 PM PDT
Dan says:
Should also note that the holding tank for the gas is located underground so it is unlikely to be affected much by daily fluctuations in the air temperature above ground. Seasonally affected, sure, but a warm day doesn't necessarily mean that the gas is also warm.

Just my take..

In reply to an earlier post on Apr 27, 2012 12:30:24 PM PDT
Last edited by the author on Apr 27, 2012 12:32:03 PM PDT
mtxjohn says:
#1 way to improve MPG-adjust the NUT behind the wheel!! I was getting 26MPG now I'm averaging 36+MPG (40 best) in a car rated for 24MPG epa mixed. How did I do it? Mostly changed my driving. I slowed down, use momentum, coast when possible, 35-40psi tires, synthetic motor oil/tranny fluid, no ethanol, etc. I need no stinking hybrid. Im getting mad MPG in my 200HP, 2.0 liter RSX-S.

Arguing over the temperature of gas is STUPID. Sorry guys.

In reply to an earlier post on Apr 27, 2012 1:44:50 PM PDT
JackV says:
That's for sure. When I towed my boat, I filled up my 100 gallon tank, drove home and it sat in the sun. Well, I learned NOT to fill it up so much since it all started flowing out as it all warmed up.

In reply to an earlier post on Apr 27, 2012 3:19:36 PM PDT
Last edited by the author on Apr 27, 2012 3:20:03 PM PDT
You are right if the gas in the tank is not filled every couple of days. (Takes time for 10,000 to 20,000 gallons to stabalize to ground temp.) If the tank is filled every day or every other day like around were I live, or at Costco every six hours or so. The the temp will be above ambient temp by a little bit 10 degrees or so were I live. Refined gas is warm (refining processes use high heat to crack the oil molecuels) when it is put into the above ground storage tanks. Those tanks are usually warmer then the surrounding air due to the incoming just refined gasoline. Your average tanker truck has a capacity of 8,000 gallons. Takes time for it to cool to ambient. Ambient below ground is cooler then ambeint above ground hense longer to cool. If you go to a station that doesnt pump a lot of gas then it will most likely be at ambeint ground temp for the area. If you go to a station that pumps a lot of gas, the it is likely to be well over ground ambient temp. Hope it makes sense. Cheers.

Posted on Apr 28, 2012 7:08:13 PM PDT
davismltc says:
I increased my gas mileage to 85mpg on regular pump gas (even with 10% ethanol) without hardly trying. It was easy. I parked my car and bought a slightly used 250cc Honda Rebel motorcycle. I changed the sprockets to slow the little sewing machine engine down a little. It's great for short hops and running errands. Easy to park too. Plus, if I ever get wacked, I get to check out Obama-care first hand!

Posted on Apr 30, 2012 2:22:49 AM PDT
Darrel says:
Try adding a new K&N air filter, these filters do increase MPG by about three or four miles at least this is what it has done for my Ford Mustang, also use high performance spark plugs these plugs burn hotter hence burn fuel more efficiently and also high performance spark plug wires. Try coasting up to lights instead of speading up to them and adjust your driving habits. Drive calmly. Avoid unnecessary acceleration and braking.Plan more efficient routes if you drive in.
Tune up your car if these steps do not improve your mileage .Ask a mechanic to check the gap on your spark plugs. Adjust or replace as necessary.Ask a mechanic to look for fouled fuel injectors. Replace them as necessaryIf your gas mileage suddenly plummets, see a mechanic. Your car may have a serious problemDepending on your car's make and model, driving with the windows rolled down instead of running the air conditioning may cause increased drag, and therefore be less efficient than running the air conditioning with the windows up Check your tire pressure. If it is too low, add air to bring tires to their recommended pressure.By choosing tires with lower rolling resistance, you burn less energy to keep your car moving.Know the factors that lower rolling resistance of a tire. Fuel efficient tires are made with materials that heat less during a drive. Heat deforms that shape of a tire making it harder to roll. Heavier tires are less efficient, as are those with deeper treads. If you live in a climate that requires snow tires, take them off as early as feasible.Don't replace your rims with those in a smaller diameter going with lower tires. This will increase gas mileage and throw off the readings from your odometer as well, unless you get it recalibratedGet the ratings. One ratings organization, Green Seal found differences of between 20% and 30% in fuel efficiency of otherwise identical tires. Michelin has embarked on a plan to cut rolling resistance 20% over its current fuel efficient line. Consumers Union regularly incorporates rolling resistance testing into its annual tire ratings. Some of the tires which received top recommendations were: Bridgestone B381, Nokian NRT2 and Sumitomo HTR 200. I have BFGoodrich tires and they still save me gas, they are low profileTire inflation is the final factor to note. Lower pressure causes increased side wall flexing. Under inflated tires can add 6% to your fuel consumption, which could easily translate into burning an extra gallon of gas with every fill up if you're getting 20 MPG. You really notice the effects of tire pressure on energy use when peddling a bicycle. One reason why road bikes have thin, high pressure tires is that the rolling resistance is far less than with a mountain bike. In fact, the Malibu Triathlon has different divisions for mountain and road bike riders. Tires tend to lose air pressure more in the winter, 1 pound of pressure for every drop of 10 degrees Fahrenheit so check tires more frequently when the air chills. Air Alert makes a set of four self-calibrating tire LED tire valve caps that start to flash when your tire pressure drops 4 pounds per square inch. Don't over inflate. Putting in too much air can decrease your car's handling as the tire adheres less and tends to skip more over the road surface.

In reply to an earlier post on Apr 30, 2012 7:18:00 AM PDT
actually ethanol does produce more energy. you just have to use more of it. thats why its used in race applications. in my old race car we used e85 and gained substantial power. but the vechile needs to be computer tuned for it.
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Discussion in:  Automotive forum
Participants:  55
Total posts:  188
Initial post:  Apr 12, 2012
Latest post:  Oct 26, 2012

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