Now I always wanted to get better mpg but for the pass 2 fill ups I have gotten better fuel economy. I used to get 220 when I fill up at Sunoco. Stopping at 16.5
Now I installed the zzp plog and now I use bp gasoline and I've been getting 250. And the previous tank is 285 before I needed more gas. So could this be the plog or the gas? I'm curious
Also this is all city driving

 

Most likely it's because we are transitioning away from the winter blends at gas station, and the warmer air going into your intake doesn't command as much fuel.

We always get better MPG during the nice weather.

 

Ahhh I thought winter you'd get bEtter mpg I c I c

 

Agree with chibi. Probably getting summer blend gas which helps with mpg

 

My ss is now getting 17-18 city and close to 29 highway. Probably due to my intake mod & keeping my engine tip top shape. But i measured it yesterday, low end i get 16.5 when driving like a nut. But I feel you though on the better MPG lol.

 

You guys are making me feel better. I have engine mods, but I do have a Magnaflow Cat and a Dynomax resonator with stock mufflers. I also have no 3rd gear, a problem that will be fixed soon. But I am getting average combo driving, 22.3 MPG. From what you all are saying, That's pretty good?

 

IF the manifold is correctly ported (to increase velocity and aid in scavenging) then you can theoretically increase fuel mileage, but that will be determined by your driving habits.