There is no lifetime MPG display. Most people want one at first, but it wouldn't really be very useful: it would change very slowly, and it would accumulate any small errors in the car's own fuel measurements.
Oh, Goodness NO! See, you write down the numbers when you buy gas, then put the numbers in the Magic Box, apply Excel to the numbers, and the Magic Box gives the answer. However, I like Hep's method better. His is based on his caffeine intake, after all.
So...after 528 miles, exactly 46.246824 MPG! That's 11.561706 MPQ! Road/Winter/Breakin miles! How much can the error be after just two fillups? 15%? If the pump shut off early last time and another gallon could fit in, I'm still getting exactly 42.522348 MPG. Can somebody give me the formula for km/tablespoon?
sadly, this is one item that the Honda hybrids have, but the Prius does not. (Hondas have a user-resettable MPG odometer, and a non-resettable lifetime MPG indicator.)
If you have a Classic Prius, just never hit the Reset button or have your 12v battery disconnected for a long time.
If you have a 2004+ Prius, sorry, the MPG odometer automatically resets whenever you fill up your gas tank. (if you never put in more than 3 gallons of gas at a time, it may not reset, but...)
most people just keep notes on how much gas they fill their Prius with, and then divide by the miles on the odometer to get your lifetime MPG.
Me too! Has a calculator built into it. Then I transfer the info to a spreadsheet I store in my USB flashdrive fob, using a PC of course.
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