Reviewed By PATRICK M (CONWAY, AR) Reviewed for a 2007 Jeep Grand Cherokee —9/15/2009 1:01 PM
I have tried the multitude of "gas saving devices" since i was 18-now i am 42 and much wiser. I did extensive research before i purchased the FFC. I have had it on an 04 ram hemi, 05 jeep grand cherokee 4.7, 03 pt cruiser turbo, 07 jeep grand cherokee hemi and now i have one for my 09 ram hemi. It works. On the 07 hemi i get real world mileage of 25+ on the interstate with the FFC, CAI, flowmaster suv 50 series muffler and amsoil synthetics. it is also 4x2. the 09 hemi I expect mileage in the 23 range, similar to my 04-maybe better-because the new hemi stays in mds more of the time. i have not had it very long for the 09 so it is too soon to give exact mpg figures yet-will update as i get empirical data.