We have a 2007 Grand Cherokee with the 4.7. It gets about 15 in the city and about 17 on the interstate (can't keep it below 80 -
) We bought it new and have put 50k on the odo and about 70k overall (tow it behind the motor home). The only problems we have had is the water pump went out earlier this year and it needed a new battery. We have done some off-roading with it - mostly forest service roads but it has kept up with a stock Wrangler in some rougher terrain! I'd rather the Wrangler for fun, but the grand is a good all around SUV.