Understanding why my mpg is declining???

[kennym4]

I would wait for summer and see if you see a difference. My buddy with a diesel see a 4mpg change from winter gas to summer gas. So it could be as simple as that

Never saw a "diesel Busa" before For real though, my buddy's a truck driver, and says the same thing ??

 

[FILT166]

I don't get that much, maybe 30 city, 40 hwy.

 

[lankeeyankee]

run atleast 2 tanks of NON ethanol fuel and check back