Hi, I recently started noticing that my gas mileage has gone dramatically down, I have not touch the carburetor at all, it has new sparkplugs and the air filter doesn’t look too bad. I also been using the exact same brand of gas 93 octanes. What could be causing this problem?

 

lead in the right foot? seriously have you noticed a change in performance? could be fuel leak somewhere, so double check all lines and gaskets as a first check. Hopefully somebody has better idea

 

No not lead haha actually i've been trying to control my self and accelerate as slow as possible wish by the way has been extremly hard.but even like that gas is going down fast! haha leaks? i don't think so at leas there are no signs on the floor of anything leaking.

 

i would say it is probably more driving style change than anything

 

It went from 1/2 tank to 1/4 tank in about 20 miles on the Highway. at a constant speed of 65 MPH

 

it may leak under high pressure i.e. after the pump or lower vacuum before the pump, my carb was leaking on theintake so no leaks seen below but did small of petrol