The Rhondabus is my work vehicle. The 20-something mpgs are a real bummer, so I try to drive it only when it's truly necessary. Since I got it, the only modifications I have made have just added more weight (tow hitch & accessories), and I can rarely ever afford to fill the tank, but I'm still tracking the mileage just to keep myself honest.
Middle-row seat removal
Trade-in for something that eats less gas!!