So i went from 235's to 33's, this is the first time i filled up since i got the tires and man i think the math came out to about 9 miles to the gallon, from about 13. So the question is how off is my trip odometer in miles? That might have something to do with the horrible gas mileage. I also used the sea foam and i think my pluges might be fowled so i will change them next week. Thanks.