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Old 09-15-2010, 02:13 PM   #4 (permalink)
5speed5
EcoModding Apprentice
 
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Join Date: Feb 2010
Location: Los Alamos, NM
Posts: 134

TBSS - '08 Chevrolet Trailblazer SS 2WD
90 day: 19.36 mpg (US)

Wife's car - '09 Chevrolet Impala SS
90 day: 22.96 mpg (US)

Big Blue Hippo - '06 Chevrolet HHR 2LT
90 day: 45.99 mpg (US)
Thanks: 8
Thanked 20 Times in 11 Posts
Quote:
Originally Posted by 06colorado View Post
Oops, just found your thread about the hubcaps.
Another question, do you have any engine mods done? (intake, exhaust, tune, synthetic fluids...)
No engine mods at all yet and just regular Valvoline 5W30 oil.
I just added a homemade tonneau cover yesterday, but that was obviously after the two 29 mpg tanks. Keeping my fingers crossed that the tonneau
will bring me up over 30 mpg before the weather gets cold.

(The tonneau cover cost me ~$80 for all materials at home depot.
If you're interested, I'll take some pics of it. It's a very simple design,
no drilling in truck, very light, etc., but still pretty user friendly)

One thing you should know is that I'm at high altitude (~7000 ft average).
That definitely plays a role as it effectively turns my 3.5L engine into a
2.8L (there's about 21% less air up here...less air means less fuel) and it means less wind resistance. I also have a pretty favorable commute as it's all rural highway (50-55 mph) with some good hills. The hills enable me to use DFCO and EOC at strategic spots. It is, however, only about 9 miles if I take the long way, so I don't get the long commute advantage and my winter mpgs will go way down as the engine will take the first 5 miles just to warm up.
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