I'm guessing anywhere from 5-12 MPG, depending on if you are towing and if the road is flat, or if you are in the mountains out West. Naturally headwinds will also affect your mileage. The best thing to expect from ANY MH is poor mileage that will shift from very very poor, to just poor, depending on the road conditions. If you plan on using the coach a lot, in all kinds of conditions and on all kinds of road, you may be able to use 8-9 as an "average" that will also vary depending on your cruising speed.