Exhaust smells

I drive a 1990 Eighty Eight, It smells like exhuast. I took it and had it checked out and they said the were no problem with the exhuast system. What could it be? Please help.

exhuast leak? or too rich or lean? whats your milage like?

exhuast leak? or too rich or lean? whats your milage like?



I notice it get better gas mileages when I burn higher grade gas.