The TrailBlazer has been averaging 17.5 mpg over 4 or 5 fillups, which could be about a month. That includes city driving, some suburban and two highway trips a week to pick up the grandson or to babysit the grandaughter. I'm probably getting 22 mpg on the highway, 14 or 15 in city type driving.
I expect the mileage to go down due to the winter weather and increased use of 4WD with the early snow we've had.
I'm thankful for the $1.52 a gallon for gas, because tomorrow, I get to take a 60 mile roundtrip to pick up the grandson, then Sunday it's another 60 mile roundtrip to take him back home.