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Hi, calculating miles per gallon isn't too hard, and the mental exercise is good. If you remember that 45 litres is 10 gallons to within 1%, then all you have to do is note how much fuel you have used to top up with and find the factor that transforms it to '45', do the same to the mileage achieved and divide by 10.
So, if you put in 50 litres and get 400 miles between visits, then you need to subtract 10% to get to the magic 45; doing the same to the mileage cuts it to 360 giving your mpg as about 36.
In a different car you may fill up more often and find you have done 200 miles on 30 litres, so your thinking goes like this, I need to add 50% to the 30 litres to get to 45, so I add 50% to the
Even with less 'rounded' figures it's not too difficult to get a figure that's accurate to 2 or 3 percent. So if my fuel amount was 33 litres to cover 200 miles, I can subtract one eleventh to get to 30 and then add 50%, giving Ummm, eleventh of 200 is about 18ish ; so 200 minus eighteen is 182 which would be my mileage for 30 litres, then add another 50%, i.e. 91 giving 273, so mpg is 27.3
Alternatively I can add an eleventh to get it up to 36 and then add another quarter to get to 45. 200 plus 18 = 218 plus a quarter is fifty fourish giving 272 ish, so mpg = 27.2
It's said that mental exercise can help to stave off dementia-type illnesses, though subscribing to newsgroups probably does the opposite.
