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Old 07-29-2009, 08:46 PM   #2 (permalink)
armygreywolf
Automotive Xtremist
 
Join Date: May 2008
Location: Fort Polk Louisiana
Posts: 25

Turbalt - '09 Cobalt SS/TC
90 day: 37.98 mpg (US)

Bayou Blaze - '97 Blazer 4DR LT
90 day: 31.87 mpg (US)
Thanks: 1
Thanked 1 Time in 1 Post
An update.

At 8488 miles I have changed the oil, switched to a K&N drop in filter and adjusted air pressure to 38 front and 36 rear cold. I also removed the rear seat since nobody is ever in it. It weighs more than I expected, probably 80-100 lbs for backrest and seat together with seat belt assemblies.

The car is factory otherwise.

I had a baseline average with usual driving habits on the same route in the same weather of 31.6mpg.

After a tank of fuel my new average is 34.4mpg

I still haven't changed my driving habits but I don't speed either.

For those interested in knowing what tires I use, they are factory installed Continental ContiSport2 225 width i am not positive the aspect but I believe 35 on an 18 inch rim. They are not eco friendly tires but do roll well.

My next mods will include a coroplast of the underside towards the rear and removal of the high rise rear wing, for both weight and efficiency, though is it possible the wing helps?
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