I have a (shuttle) bus literally was a special needs bus its an 2005 E-450 with the 6.8L v10 gas, It's 26' bumper to bumper 176" wheelbase with 6'5" of headroom after Insulation and floor I get 10mpg as long as I stay around 60mph which ain't easy as it like 65-70 which gets me ~8mpg have logged...
