Careful drivings means ....
Farnborough airport to Wolverhampton in 5th gear. 1990's 525 petrol.
Feather the throttle and anticipate - 40mpg is possible. And yes, I am aware the the load at lower rpm's is relatively inefficient and I should have dropped a couple of gears occasionally, but where's the anecdote in that?
Biting the hand that feeds IT
