I filled up last week to go from whitehaven to Oldham 300mile rould trip my trip computer said 285 miles at the start when i got to oldham I had just over a quarter of a tank left so had to put another £30 worth in, I know not alot about cars but when doing 80mph on motorway my revs were 4500 rpi I have a 1.6 petrol not sure if this is any good or what