I have a good size of tank in the boot of my S8 and get the following out of one fill of gas. I'm also very happy with the results !
2002 Audi S8 BRC Gas conversion
416 miles to the tank of gas
It cost me £75.07 for the fill off 97 litres
97 litres = 21.3 gal
So 416 miles divided by 21.3 gal = 19.5 mpg on lpg
£75.07 divided by 416 miles = 18p / mile to run
Financial equivalent £1.38 (petrol / litre) divided by £0.769 (lpg / litre) x 19.5mpg (on lpg) =
The equivalent of 35 mpg
Same car on petrol
350 miles to the tank
It cost me £110 for the fill off 80 litres (I think it was 80 anyway)
80 litres = 17.5 gal
So 350 miles divided by 17.5 gal = 20 mpg on petrol
£110 divided by 350 miles =
31p / mile to run
