Blog Date - 23 December 2017
Sharon asked me to explain how to calculate MPG because she gets asked quite often on Facebook. So here we go...
You need to know how much fuel you have used. The simplest way to do this is fill your tank up. Once this is done zero the trip meter on your motorcycle. This will be different from model to model so you'll need to consult your manual as to how to do this.
You will now have a full tank of fuel and the trip meter set to zero.
Then ride your bike.
When you're ready to refuel fill the tank once again. Get a receipt from the petrol station that shows how much fuel in litres you've put into the tank.
Remember you set the trip meter to zero when you first filled the tank? Now the trip meter will show how many miles you've covered since that fill up. Ideally if you have a pen you can write this on the receipt - otherwise you'll have to memorise the distance. Once you've noted the trip meter's reading set it to zero once again.
So you know how many miles you have ridden since the first fill up and how much fuel you've used since the first fill up.
Maths!
Oddly the UK is supposed to be a metric country but most people talk about "Miles Per Gallon" - it should be Kilometres Per Litre or even Litres Per 100 Kilometres but let us not worry about that. Well...except your receipt will be in Litres not Gallons. It is worth noting this is for UK imperial gallons - American gallons are slightly smaller.
To work out how many gallons of fuel you put into the motorcycle take the litres from your receipt and divide it by 4.54 (you'll need a calculator - I use the one on my phone).
So if your receipt shows you put in 10.35 litres then divide 10.35 by 4.54. This will give you 2.729.......and lots of decimal points. This means you put in 2.73 imperial gallons of fuel.
We're after MILES per GALLON. We have worked out the gallons and we noted the miles. All we do now is divide the miles we covered by the gallons we have worked out.
So you noted you'd covered for example 186 miles. You have worked out you put in 2.73 gallons of fuel. Divide 186 by 2.73 and we get 68.131.....and lots of decimal points. You can round this to 68, which means you have done 68mpg.
So
Divide litres by 4.54 to get gallons. Divide miles by gallons to get MPG.
A few more examples.
214 miles and 9.87 litres of fuel 9.87 divided by 4.54 gives 2.17........ gallons 214 divided by 2.17 gives 98.6.........MPG
9.65 litres and 143 miles 9.65 divided by 4.54 gives 2.12.........gallons 143 divided by 2.12 gives 67.4..........MPG
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