[Engine] Fuel compulsion,?

[dieselj]

first got mine 6 months ago. did 400 to a tank. its a 54plate 2.0 hdi. with 96 on the clock.
serviced it and started using shell fuel.
did the bg244 trick. got 430 to a tank. changed all the tyres to dunlop efficient grip and now i get 500 miles to a tank.
and i drive it heavy footed. not alot of motorway. I reckon if i was to do i really long run.......get more mpg.
I also use air con alot.
thanks to alot of people on this forum, I am now a very happy berlingo owner!