We have been all over the country in our 2000 34' Fleetwood Bounder with the triton V10 for the past six years. I keep a close eye on my gas mileage simply because I'm curious. I try to keep my speed 60-65 because that's where I feel comfortable. My gas mileage has been consistently 6 to 6.5 and I don't feel like that's too bad considering I'm moving a one bedroom apartment down the road. I'm one who is always ready to save a buck but if gas mileage is going to cause you heart burn then forget about any RV. JMHO