I've been running 305/70/17 tires with 3:42 gears this winter on my 05 GMC 4x4. Lately I've been getting any where from 9 - 11 miles per gallon. On average I drive 22 miles back and forth to work. I realize we have that darn winter blend out here, but I was thinking this is kind of on the low side. With gas prices keep rising it's killing me.