On my own personal Ford, and yes i do also have a ford , my fuel mileage indicator when i first got the truck bone stock i was getting 17. 8 miles per gallon according to my on board mileage computer and it was accurate.
Since adding a chip , a tc and other trans mods it now reads 26. 7 mpg. Now i know that is not my true mileage as my weekly fuel bill tells me my fuel economy went down not up. Right now i know it is actually getting 16. 5 since the mods but you can see how the mileage indicator can be mis-leading.
I'm sure Banks is fully aware that the onboard mileage indicators are no longer accurate after power enhancements.
Why did they chose to leave it on? Could it be for marketing reasons? any how they covered their azz by adding a disclaimer on the bottom of it.
Mmm, got to love the smell of money dont you?(lol)