Better mpg since SC fitting?

[jamiep]

Something is not right, ive not reset it since fitting the supercharger but its gone up from 16mpg pre sc fitting to 20mpg with the sc.

Fuel computer playing up surely? its twice as fast now and cant be that good on on fuel?

The more i cain it the better it gets

Next time i fill it up ill measure the mpg myself, can someone remind me how to work it out?

Edited by jamiep on Thursday 6th March 16:37

[stigmundfreud]

(miles/liters)*4.5

[crisisjez]

Mine was better too.....at the lower boost levels.

[ads_green]

To be honest, I wouldn't always expect a supercharger to worsen mpg under all conditions.

Yes it effectively a big air pump/displacer and saps power from the crank all the time. However it is possible that the supercharger can operate improving the performance for not much impact. As said above this is most likely at low boost levels usually with a slightly above neutral manifold pressure.

[jamiep]

Did 50 miles today driving to Monkfish and back, i was not hanging around and used 15.5 litres of fuel, works out about 15mpg so maybe my average of 20mpg is about right then, i still cant work out how having the SC fitted has made my car better on fuel but it looks like it has.

[AM04ARO]

Mine did too, interestingly the shorter diff ratio increased fuel.