hi just had engine rebuild and after having this done im using fuel like a dont no wat for a tenner i get about 25mile were as before i was getten at least 50 mile i had it tuned up and he said it was running a bit lean so adjusted it. its a stage 1 and running about 12psi and now and then i can smell fuel in the cabin but no petrol leaks as checked .anybody no wat can be wrong