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Originally Posted by Bernard Fishtrousers
Given that I've not reset it in 500 odd miles, it is wildly optimistic. It suggested that the car was giving in excess of 30 mpg ...
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What type of journeys have you mainly undertaken for those 500 miles Dave? If predominantly motorway cruising then 30 mpg or over is to be expected. The computer is giving your
average consumption over those 500 miles.
Quote:
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.. when I calculated using a piece of paper, miles/(litres/4.54) = 24mpg.
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Was that calculation made using the brim-to-brim method over
the same 500 odd miles? I doubt it, otherwise the two figures would be quite close.
Try this: fill the tank until the pump automatically shuts off. Wait five seconds then top it up until it shuts off again. Note the mileage and reset the mpg indicator to zero. Drive until you've used almost the entire tank then repeat the same brimming process and do the calculation. Compare with the figure on the trip computer. They should be within about 1 mpg of each other.
Simon