Bad gas mileage for no reason? Try resetting your ECU!

I was getting 14 or 15 miles per gallon I disconnect my battery and start getting 17 to 19 For two daysAnd start to drop Again

 

I recently made a 1400 mile trip mostly interstate with 33 inch tires with leveling. 70 to 75 miles per hour, and I was at about 17.2 mpg. On one leg of that trip, several hundred miles, through Nebraska on flat interstate, I reached 19 mpg. I’m getting between 18 and 19 mpg in/around town. I’m using regular 87 Octane gas with whatever they put into it.

 

How are you compensating for your 33 inch tires in your mileage calculations? If you're just looking at your truck's data, it's wrong.

 

Have a Hyper Tech cable installed to compensate, but I’m also doing my calculations outside of the system. They are very close. I have the gas buddy app installed to keep track of mileage price I’m paying etc.

 

I don't think unplugging my battery will give me +6mpg

 

I had to ditch the Hypertech when I got my 2020, which they STILL don't support (or the 2019).