Ive gone through 5 tanks of gas. tires are 265-65-17 with similar tread, nothing really aggressive. Last 2 winters I averaged in the mid 18 mpg. Whats odd is when 4wd auto is used my mpg would drop to the mid 17 mpg , now I get slightly better fuel economy in 4wd than than in 2wd. Thats why this is ...