Modding Car for Mpg - 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 64 (permalink) Old 11-17-2010, 08:09 PM Thread Starter
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Modding Car for Mpg

Yeah 37mpg highway is pretty damn good in the first place but who out there has modded their cobalt that resulted in better gas mileage. Obviously the driver has the biggest impact, and engineering wise I think they got it pretty good. Anybody try these?

Better Low roll resistance tires?
Highest psi for tires
Air induction cleaning, fuel treatment cleaner
Aero Mods:
Does the rear wing help or hurt mpg?
Under car aero mods (might be dificult)
Synthetic oil/ lower viscosity 0-20?
Air intake
Better exhaust
Bigger tires for lower rpms at speed?
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post #2 of 64 (permalink) Old 11-17-2010, 08:20 PM
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Quote:
Originally Posted by dang10010 View Post
Yeah 37mpg highway is pretty damn good in the first place but who out there has modded their cobalt that resulted in better gas mileage. Obviously the driver has the biggest impact, and engineering wise I think they got it pretty good. Anybody try these?

Better Low roll resistance tires?
Highest psi for tires
Air induction cleaning, fuel treatment cleaner
Aero Mods:
Does the rear wing help or hurt mpg?
Under car aero mods (might be dificult)
Synthetic oil/ lower viscosity 0-20?
Air intake
Better exhaust
Bigger tires for lower rpms at speed?
higher psi rather than lower psi
get tires designed for fuel economy
streamlining will help mpg
take off the wing
don't change your viscosity
hotter air helps mpg
exhaust might help too



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post #3 of 64 (permalink) Old 11-17-2010, 09:14 PM
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What I do in addition to driving method.

Better Low roll resistance tires?

Yes, Goodyear Assurance Fuel Max tires.

Highest psi for tires

Not quite. My tire max at 50 cold psi, which makes the ride horrible. I run about 44 psi.

Air induction cleaning, fuel treatment cleaner

There are enough detergents in todays gas that I do not feel the need to treat my fuel.

Aero Mods:
Does the rear wing help or hurt mpg?


Prolly hurt, but not enough to make a difference imho

Under car aero mods (might be dificult)

In the works. I am waiting to see what they do with the Eco Cruze...

Synthetic oil/ lower viscosity 0-20?


Mobil 1 fully synthetic 5w30

Air intake

K&N drop in filter. I got a good deal on it, and it will save money in filters over time. It's not all about mpg afterall.

Better exhaust

Prolly will not spend money on this. I do not see where it will help enough to be worth the investment.

Bigger tires for lower rpms at speed?

This is a possibility after my current tires wear out.

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post #4 of 64 (permalink) Old 11-17-2010, 09:18 PM
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aren't the stock tires recommened to 30?



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post #5 of 64 (permalink) Old 11-18-2010, 04:36 AM
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aren't the stock tires recommened to 30?
35

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post #6 of 64 (permalink) Old 11-18-2010, 08:20 AM
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Those recomendations are for comfort.
To improve fuel efficiency at the cost of a little harder ride put a couple more psi in there. Sidewall max as set by the manufacturer and stamped on the side of the oem tires is 44 psi.
I ran mine at 42 psi cold most of the time.

38 psi seems to be a good compromise between comfort and fuel efficiency.
Thats what my wife likes running on her '05 Malibu v6 and she gets 33 mpg driving up I95 between NC and MD.
I manage 39 mpg when driving her car if I can hook up with a tractor trailer.

I have (on my Cobalt, not the Malibu) a lower grill block, lower rolling resistance tires even compared to the oem LRR tires (Michelin Energy Saver A/S), higher pressure in the tires, Mobile 1 Advanced Fuel Economy oil.
Though most of my gains in mpg are from the route I have to work and modifications to my driving style.

Planning on passenger side mirror delete, a better grill block as mine is starting to look sad after 18 months, a belly pan, and a few others farther down the road.

65+ Vehicle modifications for better fuel economy - EcoModder.com

100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com


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post #7 of 64 (permalink) Old 11-20-2010, 06:21 PM
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true- higher tire pressure for better milage.
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post #8 of 64 (permalink) Old 12-09-2010, 07:25 AM
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Nitrogen filled tires instead of just air helps mpg without having to sacrifice comfort or go buy new tires.
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post #9 of 64 (permalink) Old 12-09-2010, 07:32 AM
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^^^ Not true. A tire at 40 psi with nitrogen will not help you get better mpg than a tire at 40 psi with air. Nitrogen does not reduce the rolling resistance of a tire.

The only reason they claim nitrogen gets better mpg than air is that your tires will not go down over time or when it gets colder.

Personally I never have or will use nitrogen. I run my tires close to max in the summer, and when the winter gets here they go down to about 35 on their own. I like that because traction is so much more important in the winter. When it gets warm again I put a little more air in them and I am ready to go.

Running high psi tires filled with nitrogen in the winter is a VERY bad idea.

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post #10 of 64 (permalink) Old 12-09-2010, 09:37 AM
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Has anyone made an underbelly pan for the balt? Or something like it?


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