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After I read this I'm starting to think I may need new O2 sensors. That or the 33's bring the mileage down to about 10 mpg. I have almost 75k, think they could be the culprit? I also don't mash the pedal at all.
Yes bigger tires will bring your mileage down. Especially if you are still on the stock gears boxes and axels. How much I don't know. If you are not getting any codes for o2's I would not change them.