Have read through "seems like hundreds" of thread regarding what everyone is getting. I am starting to draw conclusions that most people calculate there mpg's a little differently. There is just seem there are way too big of a difference in the same engine with the same rear end. I know there will be some differences because how you drive and where. I think some that are getting 20+ hwy mpg's are just calculating just that, no stopping, reset trip while they are driving and when they stop that is what they are getting. I may be way out of line here, but just had to throw it out there.

Tell us how you calculate you mpg, personally I don't calculate until i have at least ran a full tank through it.

 

I calculate it by hand every time I fill up.

 

^ same here. Miles ÷ gallons used.

 

fuelly website does a nice job of tracking your mileage... you can update it from your smartphone as you fill up.


https://www.fuelly.com/


http://www.fuelly.com/driver/byte/f150

 

Fuelly app as well for me!

 

I use the "A" trip monitor for "per tank full" MPG's, and I use the "B" trip monitor for each trip. I even take pictures on some trips to monitor gas mileage. On each fill up I right down all the information in the display, as well as the trucks odometer reading, fuel price, octane, and fill gallons. Then I have a spread sheet here at home that I keep a running record on the gas mileage. When I calculate the figures by hand, the trucks trip monitors seem to be very close. The trick is to be consistant on your fill ups. Do you just fill to the first kick off, or do you try to choke the tank? Is the truck level?, etc.. You can see a few of my monitor displays in my albums.

 

The higher hp an engine and heavier a vehicle is the more sensitive it is to driver style and driving conditions. Hence the variations.

 

Right. It's not rocket science. If you fill up to different points each time, you'll get different readings. I don't know a lot of gas stations with sharply inclined filling areas though.

I do find it amusing that people are annoyed that a vehicle doesn't measure exactly the amount of fuel that flows through the lines into the engine. While that may be possible, a car company has no payoff in doing so. And the reality is that when it's 90 degrees vs. 50 degrees, your tank takes less gas to fill it up. At -20 it takes a lot more.

I keep track of MPG on all my vehicles, always have, every single tank. Why? To a) notice if something has changed mechanically and b) because I like keeping detailed records. I know that if I drive 65 I get better mileage than at 70. Better MPG if I drive 55. All common sense.

The gallons used should be within a gallon or less. MPG should be within a mile or less.

 

^^ this

Been using it for nearly 3 years, on the previous truck, the wife's ride, and now the new truck. I calculate every time I fill up regardless of driving habits, mileage traveled, etc. In the end it'll all average out anyway.

If you click on my banner in my sig pic it'll take you to my Fuelly page.

 

I log every tank of fuel, and the odometer reading. For the last four years.

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