The engine uses no fuel when on the overrun. In effect the kinetic energy of the vehicle rolling to a standstill or slowing down will keep the engine turning over with no need for any fuel injection.I try to read the road ahead and get my speed right meaning not braking hard or putting my foot down to get back up to speed. Dont brake at all if you can as getting your car back up to speed is when you use the most of your fuel. When changing down gears dont go 6th 5th 4th etc as every time the engine will rev up and use jfuel, I like to go 6th to 4th to 2nd. I tend to fine my best MPG is round 65mph.
x 2 ....... no better way than to watch your own cars live mpg usage and adapt driving to suit.Set your trip computer to read mpg live rather than mpg accumulated, and watch how your driving style affects mpg as you drive. You'll soon see how the best economy figures can be achieved. Then buy a diesel and do the same thing. A tank full of diesel would get me there and back in my pd130.