I have 2017 F 150 XLT with a 2.7 motor. I have 2 trip odometers on the dash. My question is If I never reset # 2 odometer will it continue to calculate the fuel mileage as a running total of all miles or for just that tank full?

 

One of my trip odometers is is at 5600+ miles and shows 20MPG and the other is was reset when I bought the truck and has about 800 miles on it and reads 18.9 MPG. Guess I have been a bit heavy footed
2016 f150 XLT 2.7

 

Neither resets unless you reset them. My #2 goes back to when I drove off the lot.