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I know that having steam roller 315 rear and 275s in the front won't help fuel economy ANY but they are necessary for my other goals with the car. None of the mods I listed were originally intended to help with fuel economy. Economy is pretty far down on the list for me but efficient combustion helps both power and economy and that's what I have focused on. For the record I did get 33 mpg with a max speed of 80 mph. Some of the trip was at 45 mph on SR92. I would also like to say that none of the ideas I have discussed are mine. I'm combining what I feel to be the best ideas I can find. As far as the Z car not having cats, I'm not sure how many cars did in the 70s. I would like to thank all of you for the thought provoking interjections. Even if I fail to reach my goal I hope to learn from the experience. I welcome chriticism. I would love to hear from those of you that have actually modified your engine for better economy.
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