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Just a thought...

I drive 105 miles to work everyday and 105 from work everyday. If I do the speed limits 65 and 55 then I can average 30mpg's according to my display (which I believe is fairly accurate given how much I pay to fill it up every other day). I just bought a cheap a$$ CAI off eBay for lilke... $65 to see if I want to invest in an Injen or Volant. It would be nice to see a 2-4mpg gain as that equates to several hundred dollars over the course of a year.

So my question is... has anyone tried changing the rear gears to maybe step down the RPMs while cruising on the highway? I don't really care about performance as that doesn't help me at all given the amount of highway driving I do. Any info would be cool.

FYI, my car is a stock 2006 G6 GT 3500 with 155,000.
 

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2007 gt retractable
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324 Posts
as an experiment you could borrow two wheels and tires of a larger diameter and run them for a while to see if it helps.same difference.
 
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