@petlew:- fuel consumption of say a 54 seater coach in MPG
As expected the answer is quite complex but: The two 57 seater Plaxton Volvo engined coaches in the fleet (we don't have 54's after all) is that they do by rough rule of thumb 7mpg. The fleet varies between 5.5mpg for 72 seater tri-axle to 3mpg for a 110 (with standing) seater tri-axle double decker.
Experience; is something you gain, just after you needed it most.
When faced with two choices, simply toss a coin. It works not because it settles the question for you. But because in that brief moment while the coin is in the air. You suddenly know what you are hoping for.