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Old 05-13-2012, 04:34 PM   #15 (permalink)
bazman
EcoModding Lurker
 
Join Date: Apr 2012
Location: New Zealand
Posts: 46

Weird Thing - '00 Holden (GM) Commodore SS Series II
90 day: 18.67 mpg (US)
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Quote:
Originally Posted by mcrews View Post
I would first ask if you have increased the psi in the tires?
Since you are obviously VERY mechanicly inclined , have you thought about a slightly taller tire or working w/ the rear ratio?
I run around 38psi which is about as much as I want to for traction and handling balance. The car has big front and rear sway bars, Bilstein shocks (as good as shocks get), diff brace w/Harrop Tru Trac, poly bushings everywhere and new stiffer springs - it handles very well.

For a one off economy drive I would run tire pressures up to max.

Current gearing is tall for a 5.7. I'd go taller with an LS7. I may very slightly lift it via going from 235/45 x 17 tire to a 245/45 but the extra width increase in rolling resistance will partly offset the taller gearing. The height would be mainly for extra clearance more than mpg - some speed bumps around here are brutal.
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