It's a carbed, 1990. The tank was removed for cleaning, and never put back on. It fires up with a squirt of "E" and sounds pretty good. I haven't bought it, but seats are removed, has factory a/c, and I (I think) 4 wheel disc brakes. I can get the bus for $800.00. Think I can get a newer, low mileage, 6.0 & transmission out of 2500 HD truck for about $2500. Not a bad starting point, but I know how quickly it will escalate.
what year is the bus? if its in the 90s it will have a TBI injection system... if the check-engine light comes on when you first start then goes off and ther engine is running perfectly then not much you can do.. and engione swap to a diesel or a more modern one is pretty heavy duty.. you'd be nbetter of selling the bus and getting one that has what you want.. 4-5 MPG. sounds a little low deoending on what transmission you have..
if you hgave TBI on your 366... coolant temp sensor and O2 sensors are a couple things that can go bad and screw up the fuel mixture and mess up MPGs..