My brand new fiat panda 750 fire has a great fuel concumption, I can't understan why, i change spark plugs,oil, the carburettor has co% 1.00 and passed the check of MOT...if is not the evaporation of petrol (and it seems to me not possible,even if i don't feel that the after market key-cap is very suitable..) and i have to clean the carb, I think it would be better to change it with a double body one..but WHICH ONE? the original is a weber 32 tlf 11/250, does anyone knows stgh 'bout it?
Thanks a lot

Filippo