2015 tacoma gas mileage

Thank you!

 

Take a picture of your wheels/tires and post the picture. I wonder if you have load range E tires on the truck, that would explain part of it but probably not all of it.

Llike @Naveronski said, calculate your mileage using actual miles traveled divided by actual gallons used. Let us know what that mileage calculation says, as well as describing your driving style during that tank - speed, freeway vs. many short trips, etc.

Consider the situation where your fuel tank sending unit is malfunctioning, and it says you have 1/8 of a tank when really you have half of a tank still. Sending unit problems are not uncommon on the 2nd gen, usually on a vehicle with a lot more miles, but its a possibility.

 

It sounds like the initial MPG calculation may not be accurate so this is the first thing I'd do too: