MPG calculations

So my UltraGauge 2 says that I'm averaging 16.6 MPG, but my math is telling me that I'm getting 14.2 MPG.

Im getting 300 Miles by the time my gas gauge is on E and the Tacoma has a 21 Gal tank. 300/21=14.2MPG

Any ideas? Is there something I'm missing? (i.e. reserve in the tank im not accounting for) Is the UltraGauge not all that accurate?

 

You need to divide by how many gallons you put in the tank when you fill it, not the capacity of the tank.

At fill up, set the odometer to zero. At next fill up divide what's on the odo by how many gallons you put in. Then you'll have your MPGs for the last tank of gas.

 

alright will do. thanks for the advice

 

Should also say that this is dependent on you filling your tank all the way up each time.

 

Are you running larger tires? If so did u recall the Speedo on the Ultragauge? If you do have larger tires then what u travel and your vehicles odo are going to be different. U need to calibrate your Ultragauge to your conversion factor and use the "trip miles" function on your Ultragauge when u go to calculate your mpg

 

For instance if you are running larger tires your tacos odo might only say you've traveled 20 miles but you might have traveled 21.5 in reality. Now do that for 350 miles n that could make a considerable difference on your calculation.

 

good call jimbo. i am running 265/75-16 so that might be making a difference, and la0d0g i am filling up completely each time.

 

Thanks than that is definitely what it is. If you did the recal option on page 39 then your ultra is looking at a different miles traveled. Just add the trip miles gauge to one of your pages and when you do your calc use that value

 

I bet you are only filling 17.5-19 gallons. Use what you pumped not 21 as said before. You'd think that was obvious.

 

This too. Plus I don't know if it's diff but my 2014 manual said 21.1 gals is full.

 

Fill the tank , set trip odometer , when you go to refill the tank divide miles travelled by gallons required to refill the tank

/thread

 

yeah i wasn't recording number of gallons put into the tank. i was just dividing by the total capacity

 

Jimbo my ultra gauge came with no instructions and i cant seem to find how to do this through the menus. how do i calibrate it for the larger tires?

 

User manual can be found here. It should have the answer to your question.

 

thanks. found my answer

 

Were u able to calibrate it to the larger tires. Mine came with no instructions as well so I stopped using it.

 

^^^

Page 39

 

Got it. Thanks a lot.

 

Haven't done it yet. it requires you to drive 3 miles at greater the 50 mph. will try and get them done tmrw

 

Sorry ive been preoccupied otherwise i woulda shot you the link. Makes sure that its a straight stretch if you can manage it.