39.1 going on 40mpg!
Join Date: Apr 2005
Location: Boston, MA
Thanked 22 Times in 14 Posts
Excess fuel consumption, excess emission, and spark plug fouling to name a few... EVAP systems are a PITA to diagnose if it's not something obvious like a loose sealing gas cap.
I'd start with cleaning the filler neck area of rust and cleaning the rubber seal around the gas cap first to see if the problem goes away.
BTW, what car is it?
2013 Accord EX-L Navi 11,178 miles and counting...
. . . . Last tank mpg = 32.2mpg
2005 Accord EX-V6 Sedan (3/05-1/13) retired at 127,110 miles
1993 Accord 10th Anniversary Edition Sedan (5/08-7/10) Retired at 153,007 miles
2000 Civic Si (5/00-3/3/05) Retired at 59,500 miles