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aren't we making this more complicated than it need be? To compare the relative costs it is simply the cost of fuel / the miles travelled (the output is pence per mile). This works for both petrol and electric and is a perfectly valid comparison. This way you dont need to fiddle about with Kw / mile which may get a number no-one really feels they understand or can compare easily with petrol.

Also no need to run to empty or near empty to calculate the petrol use you - whatever you put in is how much you've used since you last filled up! Divide the cost of that by the miles you drove...
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