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Message: [QUOTE="superstroked, post: 85404, member: 154"] I have never gotten anywhere near that kind of mileage with my 3.55's. I don't drive for "hyper mileage" and generally run around 75-80 on the highway. The tires I have don't help my cause either( I lost about 1-1.5 from stock). The best I have seen since putting them on is about 14 or so. That being said, usually if I take a long highway only trip I have one of the trailers in tow. Otherwise We will take the equinox so, I am not sure what it would do unloaded on the highway between 70 and 75mph. Hope that helps. In theory it should save you fuel mileage switching out your gears but, above 70 wind resistance really starts to comes into play. So with the gear ratio change in order to keep the rpm's in the sweet spot (between 1700 and 2000) what would that put your speed at? I am sure someone can calculate it. If it is around 80 at 1800/1900 rpms, it may be like pissing in the wind due to the wind resistance. just some things to think about [/QUOTE]

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