How to calculate MPG over 99.9 using the Eco Savings screen

Fuel cost entered as $3.20. To arrive at an internally consistent MPG figure, divide $3.20 by $.37 and multiply the result, 8.648, by 13.3 miles and arrive at 115 MPG. This is, of course, a small sample size and will be somewhat inaccurate. The larger the sample, the more accurate the figure becomes.

We all know that the computer figures are somewhat optimistic, but this is internally consistent and may be used for all the contests and challenges that measure MPGs here on Prius Chat.

This little run began and ended at the same spot. The car is capable of some amazing stuff.

 

Is it possible this has become too complicated? Let us say that fuel at the pump was $3.20 and entered as such into the computer, either at fuel up if you are fast enough or on the settings screen.

Let us say that you choose to keep track of a run on trip meter 'B', so you zero it out.

Let us say that you drive until the Eco Savings screen indicates you have used $.32 listed as 'fuel cost B'. You have now used 1/10 gallon of fuel. 3.20/.32 = 10

You look at the number of miles driven and multiply that by 10 to arrive at MPG. Same thing for any other furl cost number. OK?



3.20/20.81 = .1538. .1538 x 408.8 = 62.87 or 62.9

Oh, WAIT ! I like Sage Brush's explanation better.

 

I don't drive like a snail all the time, just for the fun of it to explore the car's capabilities. If you think that I used over 8 gallons to drive 13.3 miles, you still misunderstand the concept.

 

For the *very* few persons who will be interested, I have posted a series of You Tube videos showing how the car managed 119 MPG. over a short loop.

Just search ufourya22.

Here is the last one: