Mine has the 360 engine and was getting about 12 mpg. I installed a Jacobs electronic ignition, a K&N air filter system and switched it to Castrol synthetic oil and now get about 14 to 15 mpg. Don't know that the expense was worth the increase though.
I have always loved the way mine drives and handles compared to all the other SUV's but it does love gas. My son has the Eddie Bauer Explorer and it is aweful in comparison.