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your going to REALLY need to lower the rpm to get 40 at 80. there is a new guy here with the old big body caprice getting some crazy numbers but hes running a 2. 7 (??) rear ration and taller tires.
Since you just bought tires, you'll have to wait to go up size.
And thinking that your 'cutting the corners faster' is gaining anything is false.
how often are your 'turning'??? maybe 10% of the time?
if you're turning more than that, you'll NEVER get better mpg.
you would be better off with taller tires because if you are on the freeway, it's all about low rpms.
Do taller tires and nylon bushings on the sway bar and suspension points if you want to race thru corners.
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