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Discussion Starter · #1 ·
Average fuel consumption = Test mileage/ Total gallons of gasoline used during the test period
Let us use the following as an example:

Initial mileage is = 24,500mi
Final mileage is = 25,000mi

Test Mileage = (25,000-24,500)
Test Mileage = 500mi

I conducted this test for a 7-day period

Day 1 = 1 gallons
Day 2 = 2 gallons
Day 3 = 4 gallons
Day 4 = 3 gallons
Day 5 = 4 gallons
Day 6 = 2 gallons
Day 7 = 4 gallons

Total test gallons = ( 1 + 2 + 4 + 3 + 4 +2 +4)

Total test gallons = 20 gallons

Average fuel consumption = Test mileage/ Total Test gallons

Average fuel consumption = 500mi/20gallons

Average fuel consumption = 25miles/gallon

How do I know if this calculated average fuel consumption is right, is there an additional yardstick I could leverage?
 

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'17 C 4
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How do I know if this calculated average fuel consumption is right, is there an additional yardstick I could leverage?
NO. There is no possible way that it could be "wrong".
Doing it over several days like that even means that it should not even be "off" by more than a tiny amount.

BUT......your driving conditions must be in the "severe" category or you are in serious need of some maintenance work because 25 MPG for a Prius in good working order that is driven conservatively is WAY low.
 

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If I get you right you are trying to be sure that your vehicle’s fuel consumption rate is normal and not unusually high. If this is the case you can make a comparison with the data provided by fueleconomy.gov which is readily available on every car's window sticker.
The window sticker also known as the Monroney sticker can be generated from INSTANT VIN REPORT and or Monroney Label, either way, you could find a reasonable yardstick for comparison.
 

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Discussion Starter · #6 ·
He hasn't been back since the day he posted his question.

I don't understand why people waste their time doing crap like this.
And waste our time too when we take them seriously.
:mad:
My apologies @Easy Rider for my late response, you know how thing go these festive period. Thank you Easy Rider for giving me more confidence, i really appreciate and thank you @WinLange for the figures your pictures showed, @Easy Rider answered my question.
 
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