Discussion Starter · #1 ·
I recently got a Passport Elite and broke it in with a family trip from Louisiana to Georgia. On the way back to Louisiana, I decided to double check the MPG that the Passport records by also checking it the old-school way. The Passport says around 22-23 MPG and I was pushing it pretty good at around 80 MPH average on open highways and using adaptive cruise control primarily and in Econ mode. Some other relevant information is that the vehicle was rather loaded with 3 people and full of cargo, I have roof rails and cross bars, and I have factory rims/tires (fully inflated with nitrogen). Considering those factors. I wouldn’t have a problem with that kind of fuel mileage. However, when I double check the numbers manually, I am getting about 1-2 MPG lower than the Passport reads. This is with serval fills ups across the US South and the terrain varies somewhat. I get that there is a margin of error considering that I can’t know that I am filling up to the exact same amount (to count accurate difference), but that is a 10+% difference in some cases. That doesn’t seem right to me. I am curious if anyone else has found the same instead of just going on their Passport’s information alone. Is it an inaccurate calibration (perhaps because Touring and Elite have different tire diameters than Sport or EX-L), or is it just a known fact that we get cheated at the pump with less in than the gas pump gauge actually reads?