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Old 02-27-2010, 12:59 AM   #5 (permalink)
5speed5
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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
Just want to make sure you're holding the throttle body open when doing the
compression test. Some people forget to do that. 40 mpg sounds low to me.
50+ mpg should be the norm for a Metro driven as you describe (assuming it's a
5-spd manual). However, I notice you're in CA. You could be the victim of
oxygenated gasoline.
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