Last tank was 45.81 mpg, this tank was 48.52 mpg. Since adding the Kammback I'm getting an additional 2.71 more mpg. About a 6% increase. Will leave it on and see if it holds. Certainly don't think it's hurting the mpg. Was averaging well over 50 mpg over the summer. This cold is taking a hit on my mpg. Car takes forever to get up to operating temp. Almost afraid to try and block off any of the radiator. Don't want to overheat it and really mess things up.
VT247
