Facts and Myths About MPG's - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
All about MPG All about maximizing your Miles Per Gallon (MPG)

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post #1 of 68 (permalink) Old 12-09-2009, 12:44 AM Thread Starter
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Facts and Myths About MPG's

Dimples on a car does increase highway fuel economy
Drafting within 200 feet of a large truck does increase fuel economy
Driving with the tailgate down (not on cobalts ) decreases MPG
Electric superchargers have not been proven to help fuel economy
Those tornado or vortex things that go in the intake line do not increase MPG
Those "chips" that retune the IAT to 30 degrees decrease fuel economy
Anything claiming to increase your MPG by more than 3 is false
Vortex generators do not help mpg's on a cobalt at least
Gas treatment, fuel injector cleaners, things like that do help fuel economy but not immediately, more in the long run by keeping the engine cleaner
From what I have found using a scan gauge II auto computer that reads gallon per hour of fuel used, I have found that idling in neutral uses .1 GPH less fuel than drive
Coasting on a highway in 5th gear will read 0.00 GPH at roughly 2500 RPM depending on speed, but in neutral it will read .3-.4 GPH at less than 1200 RPM.
An intake and exhaust will usually increase MPG and HP and are pretty much the only two items that can legitametly increase both MPG and HP at the same time. The only reason the factory gives you shitty intakes and exhausts are to keep the cars quiet.
Underinflated tires can greatly decrease MPG so keep them inflated.
Low rolling resistance tires increases fuel economy
Weight reduction mods increase fuel economy
Streamlining a car increases aerodynamics and usually helps
From what i've found, is that using the AC at idle increases GPH by .1-.15 no matter what setting it is on.
Higher octance gas usually increases MPG but mostly on the highway
Magnetic fuel Ionizer things are garbage


Some other things that don't hurt MPG but some people claim that they increase MPG but these aren't really proven are tint (less strain on the AC), lowering the car (better aerodynamics), certain designs of spoilers, synthetic oil vs regular oil, higher performance battery and alternator (less gas to spin the alternator if it runs better),

The biggest ways to increase MPG are simply change your driving habits. That can be a new thread though.



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post #2 of 68 (permalink) Old 12-09-2009, 12:48 AM Thread Starter
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oh one more myth
water for gas which is simply shooting HHO into the intake line by creating electolysis in a mason jar full of water and baking soda to create the gas then sending a line to the intake. I want to try this and see for myself if it increases MPG but I haven't seen any claims saying it hurts mpg but then again I haven't seen any credible claims saying it helps MPG either



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post #3 of 68 (permalink) Old 12-09-2009, 08:22 AM
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What would you say is the optimum tire pressure for good fuel economy, but decent dry/ wet handling?

Good facts and myths.

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post #4 of 68 (permalink) Old 12-09-2009, 12:18 PM
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nice post...

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post #5 of 68 (permalink) Old 12-09-2009, 04:23 PM
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Quote:
Originally Posted by NitroheadZ28 View Post
What would you say is the optimum tire pressure for good fuel economy, but decent dry/ wet handling?

Good facts and myths.
My guess is whatever the manufacture recommends

If you stiff me on the tip, I'll leave an = on your driveway to get even.

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post #6 of 68 (permalink) Old 12-09-2009, 05:09 PM Thread Starter
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Quote:
Originally Posted by NitroheadZ28 View Post
What would you say is the optimum tire pressure for good fuel economy, but decent dry/ wet handling?

Good facts and myths.
I'm still doing research on tires. I can't decide on a new summer tire. And as for PSI, whatever the factory tells you is probably best for fuel economy. Underinnflating will give you more traction though like for offroading.



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post #7 of 68 (permalink) Old 12-09-2009, 09:01 PM
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On Mythbusters, they proved that running with or without a truck tailgate down, does not affect mileage and also with or without AC on does not affect mileage.
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post #8 of 68 (permalink) Old 12-09-2009, 09:12 PM Thread Starter
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Quote:
Originally Posted by Jimbug View Post
On Mythbusters, they proved that running with or without a truck tailgate down, does not affect mileage and also with or without AC on does not affect mileage.
The a/c results are from what my own mileage test showed. And mythbusters the first episode they filled up the tanks on their two trucks and simply drove to see which one outlasted the other, the truck with the taillgate up outlasted because with the tail gate up it allows for a vortex to be created just behind the window of the cabin and it shoots air over the tail gate, lowering the tail gate destroys that air flow. The best option though on a truck is a tonneau cover



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post #9 of 68 (permalink) Old 12-09-2009, 11:07 PM
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this is off topic, but do you guys get bad gas milage when its cold? i filled up sat. drove maybe 100 mils and im alrady about a half a tank.
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post #10 of 68 (permalink) Old 12-10-2009, 04:50 AM
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Quote:
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this is off topic, but do you guys get bad gas milage when its cold? i filled up sat. drove maybe 100 mils and im alrady about a half a tank.

Yes weather will affect your MPGs. I know it sucks..




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