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Tips to improve mpg?


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Showing 1-25 of 188 posts in this discussion
Initial post: Apr 12, 2012 9:31:03 AM PDT
Fidel Amaya says:
I know going light on the pedal improves it but are there any upgrades that you can do to your engine that can help?

Cold Air Intake/Short Ram Intake?

Posted on Apr 12, 2012 11:40:31 AM PDT
Tan N. Vu says:
1. Keep the car well maintained.
2. Regularly check tires' pressure and keep them properly inflated.
3. Keep it light (i.e. removing unneeded stuff stored in the trunk).
4. Roll up the windows while driving.
5. Turn off unnecessary electrical accessories (radio, ac...).

Posted on Apr 12, 2012 7:47:38 PM PDT
ldicker says:
CAI/SRI can actually REDUCE gas mileage. More air into engine means more fuel consumed.

There are no simple upgrades you can make that will reduce fuel economy. There are a lot of products out there that claim they can but none of them work at all and some of them seriously harm fuel economy.

Also, A/C will kill your gas mileage.

In reply to an earlier post on Apr 13, 2012 3:51:43 AM PDT
And remember that when your heater control is in the Defrost mode your A/C pump cycles on and off .

In reply to an earlier post on Apr 13, 2012 3:54:11 AM PDT
[Deleted by the author on Apr 13, 2012 3:54:38 AM PDT]

In reply to an earlier post on Apr 13, 2012 4:23:05 AM PDT
Dan says:
More air doesn't necessarily mean more fuel.. the engine can run leaner if it has increased oxygen to help burn the fuel more efficiently/thoroughly.. that's why it tends to increase mileage. More energy can be extracted (through combustion) out of the same quantity of gas if oxygen is readily available.

In reply to an earlier post on Apr 13, 2012 6:02:05 PM PDT
M. Alexander says:
I think that the intakes might work on an older vehicle....on a newer vehicle, not so much; unless the vehicle is re-tuned to run leaner than factory spec, the O2 sensor will communicate the leaning exhaust gas to the computer, where it will probably add more fuel.

Modifications that can be made to increase mileage (Only 1-5 deal with the engine)
1. Use a lighter body oil...but don't go too light (if u are currently using 10w30 or anything heavier, try 5w30 or 0w30...DO NOT USE 0w20)
2. Synthetic gearbox oil (better mpg for manual gearbox, not as much gain in automatic)
3. Retune factory computer or add aftermarket engine management and tune for fuel economy
4. Thicker gauge grounding wire (really only works for older vehicles)
5. Turbocharging...A small turbocharger can be used and tuned to provide more lower end power, allowing you to drive with lower overall RPMs. Less gear changes and less friction at lower engine speeds translates to better fuel economy. http://autospeed.com/cms/A_109931/article.html
6. Slightly Over-inflate your tyres... probably 2-4 psi over recommended pressure and DO NOT EXCEED the maximum pressure of the tyre. you might lose some overall grip though and u run the risk of wearing out the center of the tyre quicker.
7. Lighter wheel and tyre package...any wheel and tyre package that weighs less than what you have on the vehicle will increase mileage (less mass to accelerate equals less fuel consumed). FORGED RIMS are lighter than their equivalent size cast rims and are really expensive.
8. Skinnier/Eco tyres...decreased rolling resistance, also a loss of performance

In reply to an earlier post on Apr 13, 2012 8:38:21 PM PDT
Dan says:
Well, not sure what to make of it, but I took out my stock intake and put in an SRI on my supercharged 2000 grand prix last week. My fuel economy seems to be improved. I also started using pure gas (0% ethanol) which has been proven to improve gas mileage due to the greater energy content of gas vs. ethanol.

In reply to an earlier post on Apr 13, 2012 8:55:39 PM PDT
Carl G says:
Fidel, jack the rear end up and install larger tires. That way your car will always be going down hill. lol

Posted on Apr 14, 2012 8:39:00 AM PDT
Henry Will says:
@CarlGlas: great idea ROFL!

Posted on Apr 15, 2012 8:43:28 PM PDT
Bkdent says:
[Customers don't think this post adds to the discussion. Show post anyway. Show all unhelpful posts.]

Posted on Apr 16, 2012 6:31:50 AM PDT
ThorMJ says:
Cai shouldn't reduce economy--the air is being limited by the throttle if you're being light on it.
The engine is an air pump; anything you can do to make the air flew better will improve power and gas mileage (if you can hold off on the power, a turbo works well.... But its hard not to excite a turbo).

shift early, shift often. LRR tires (and there are some good ones out there-- not slicks, bit not bad),
Use a vacuum gauge and you'll do much better at finding the cars sweety spot (you're going for keeping the vacuum high and RPM low as much as possible).

Posted on Apr 17, 2012 8:51:09 AM PDT
Terry says:
If you have over 100,000 miles, replace your O2 sensors. That got me almost 1.5 MPG.

I drive a 2000 Grand Marquis. I started at 17.5 MPG with mostly city driving. I am now up to 21.5 MPG

O2 sensors got me to almost 19 MPG, driving like an old man got me to just under 20.
I just replaced the airbox and MAF sensor with a larger one from a newer Crown Vic, I am now at 21.5 MPG. That was an expensive mod though. Junk yard airbox and MAF Sensor, but need a "tune" and a tuner to load it. I was $500 all in. So the almost 2 MPG gain will take awhile to pay back that investment.

Find some forums for your specific car and start reading and asking questions

There are ways to make cars more efficient.

In reply to an earlier post on Apr 17, 2012 3:17:16 PM PDT
OldAmazonian says:
Even running a couple of 40-watt headlamps reduces mileage a little.
http://mb-soft.com/public/headlite.html

Posted on Apr 17, 2012 9:38:25 PM PDT
Carl G says:
I think C Johnson has brown eyes.

In reply to an earlier post on Apr 19, 2012 6:09:58 AM PDT
DannO says:
Would you please explain this theory.?? What is the link between headlamps and fuel consump

In reply to an earlier post on Apr 19, 2012 6:20:48 AM PDT
Last edited by the author on Apr 19, 2012 6:23:48 AM PDT
Dan says:
Read the article he linked to.. the extra load on the engine from the alternator required to generate the additional electricity for the headlights means that more gas is consumed when the lights are on. This no doubt also applies to other high-amperage electrical appliances in the car, of course.. such as the rear-window defrost, seat-warmer, blower fan (used at high-speed), and stereo if you have a beefy system with subwoofers and amps etc.

Main issue is that most new cars these days force DRL (daylight running lights), which wastes energy/gas. I disabled them in my car for this reason, and also likely causes the bulbs to die quicker and the lamp casings to fog up over time.

In reply to an earlier post on Apr 19, 2012 6:22:48 AM PDT
DannO says:
Finally, Thor adds accuracy and logic to fuel consumption. It's basic and simple....""stay out of the throttle" with HIGH manifold pressure and LOW RPM's. Volume's of accurate technical data on this subject.

Posted on Apr 19, 2012 12:55:03 PM PDT
Carl G says:
It sounds like nit picking to me.

In reply to an earlier post on Apr 19, 2012 7:41:15 PM PDT
JackV says:
[Customers don't think this post adds to the discussion. Show post anyway. Show all unhelpful posts.]

In reply to an earlier post on Apr 19, 2012 7:46:40 PM PDT
Dan says:
lol, troll..

In reply to an earlier post on Apr 19, 2012 9:07:00 PM PDT
Carl G says:
I have been running a mixture of 78 percent nitrogen, 21 percent oxygen, and 1 percent other gases by volume in my tires for about 40 years now and it has served me well.

In reply to an earlier post on Apr 20, 2012 9:52:30 PM PDT
Last edited by the author on Apr 20, 2012 9:53:24 PM PDT
M R says:
I drive a manual dodge ram 1500 1/2 ton, crew cab, short box, and I am usually in 4th gear around town, and cruise around in neutral also, and I can't seem to get more than 16 mpg. This is, of course, according to the digital read on the overhead display.

Are these things accurate? The low RPM's don't seem to work for me very well, I am REALLY good at driving this beast under 1500 RPM's...

In reply to an earlier post on Apr 21, 2012 12:05:11 AM PDT
Dan says:
Well.. you could cross-check the mileage by doing the simple math the next time you fill your tank. But.. you're driving a large heavy pickup truck, so you probably won't be getting much more than 16mpg -- depends on your engine though.

The biggest positive impact on fuel economy is being able to make the lights and get around traffic, touching the brakes as little as possible. sometimes speeding will increase your mpg if it gets you through the lights before they turn red.. but at the same time, if a red light is close ahead, you'll benefit from going slow enough to get the green if you can avoid stopping.

when i had a manual honda civic, I was getting over 40mpg in the city.

In reply to an earlier post on Apr 21, 2012 2:51:25 AM PDT
mrbreezeet1 says:
aw yeah, the radio really sucks down the gas,
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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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