Most fuel computers are “optimistic” when it comes to your miles per gallon readout. Use our MPG Calculator below to work it out for yourself. We would recommend using data from a fill to fill tank to ensure your results are as accurate as possible. If you find this page helpful then please share the love using the buttons below.

Manual Calculation
For those that would prefer to use the trusty Casio calculator, the formula is below.

Distance covered (divided by) litres = miles per litre. Miles per litre (times by) 4.54 = Miles per gallon

Or :  MPG= (Distance / litres)4.54

We’ve also put together a had MPGe calculator for those EV users out there