oneton

Also it could be winter blend for ease of starting in colder weather & better cold driveabily

diskullman

My best mileage in NJ was attained when gas was over $4. There were simply less people driving. Now in December with gas down to $1.49, there are a lot more drivers on the road, including holiday shoppers. It is also very important (for me) to check your average speed, and zero it out when you fill up. I find my gas mileage drops as the average speed drops.My usually average speed is 25 MPH, when it drops to 23 MPH, so does the gas mieage. If I ever get to put some highway miles on, the gas mileage goes up with the average speed.

Rcflyboy

The entire time I have had the CGS installed the the outside temp has been in the 40's or lower and gas prices have been falling. I have zeroed out my mileage on highway trips and have constantly averaged 2 to 5 MPG less. Not once have I averaged 30 or more like I was with the OEM intake.

Funny though, I will have stretches where my mileage is excellent on a 30 mile or so trip and then I will return from said trip and get worse mileage. Nothing really changes (temp, wind, ect..) just worse mpg. Strange!

Anyone know when the winter gas formula went into effect he in the Midwest?

Still not sure if it's the CGS, temp, or gas that is causing the loss of MPG.

BigMOCats

Who cares, not like you're only getting 8-10mpg. If you're in the 20's all is good, image is everything.