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Thread: How does this fuel calculator work?

  
  1. #1
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    EazyDuz's Avatar
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    How does this fuel calculator work?

    This is the way i work out MPG:

    Total number of litres in a brimmed tank converted into gallons.

    Total distance driven (before flashing light comes on) divided by total number of gallons in full tank.

    For example:

    53 litres in full tank converted into gallons = 11.6583 gal(UK)

    Total distance driven before flashing light = 365 miles.

    365 divided by 11.6583 = 31.30 MPG


    So i figured i'd try this calculator

    http://www.fuel-economy.co.uk/calc.shtml

    Under 'real life miles per gallon'.

    Fuel cost: 122p
    Total spend: 53 litres
    Distance: 365 miles

    ^^That is what i did last time i filled up. The calculator came up with:

    Your real-world MPG average is 38.20, covering 365 miles using 9.56 gallons of fuel.

    How does that work?

    Also, if the Astra Mk4 has a 53 litre tank, why does it never cost me more than £54 to fill it from the flashing light, surely you are down to fumes when he light is flashing?
    Thanks

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    Blistz's Avatar
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    Your real-world MPG average is 30.02, covering 350 miles using 11.66 gallons of fuel.

    wish it was more

    thats a 1.8 SXi Mk4
    Yet another p0100 and p0110, fault code sufferer with the X18XE1

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    graeme647's Avatar
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    Erm...

    Nope, when mine flashes I've still got about 5L left...

    I always fill the car and reset the odo at the same time, then when I fill up again I simply divide my mileage on the odo by the number of galons it took to fill up... Also depending on what mood the cars in I can be flashing as I pull away and then it goes up to 1/4 tank within a few mins so i don't really trust the fuel gauge as more than a rough estimate...
    N.b. any opinitons expressed above should be ignored and considered 'ramblings', under no circumstances should they be relied upon...

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    I think re the flashing light you still have a bit in reserve, cars differ I had a punto sporting many moons ago that used to run out of fuel on 1/4 of a tank I also had a St220 which did 45miles on zero range because I was about to p/x it and didn't want to put a penny in!

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    Yea but which calculation is most accurate, mine or the websites? Both have significantly different results.

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    Fuel cost: 122p
    Total spend: 53 litres <<<< Not your total spend, s/b 64.66
    Distance: 365 miles

    But you're still not using consumption, you're using tank capacity, will be a significant difference between the two...
    N.b. any opinitons expressed above should be ignored and considered 'ramblings', under no circumstances should they be relied upon...

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    The way I do it is brim the tank, when I fill it again might put in 50litres say and of done 350 miles (I wish)

    50Litres is 10.998 gallons
    350 divided by 10.998 = 31.84

    Its pretty much the way you do it but your calculating on it using every drop of fuel in your car when you could still be kicking about with 3litres in.

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    Quote Originally Posted by graeme647 View Post
    Erm...

    Nope, when mine flashes I've still got about 5L left...

    I always fill the car and reset the odo at the same time, then when I fill up again I simply divide my mileage on the odo by the number of galons it took to fill up... Also depending on what mood the cars in I can be flashing as I pull away and then it goes up to 1/4 tank within a few mins so i don't really trust the fuel gauge as more than a rough estimate...
    lol same as mine. some time is think it's her time of the month when it does that. the light flashes, and as im near a peterol station, it goes away all together lol

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    So after 365 miles what is my cars MPG?

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    Your calculations more or less correct mate except your tank still had fuel in it do you have the petrol receipt to see the exact amount of litres you put in?

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