04 MPG calculation error - Alfa Romeo Forum
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04 MPG calculation error

I was driving my friends '04 SW 1.8 Ti tonight. According to its on board computer its doing 22.9mpg. He is not a happy chappy

I was able to prove to him that the centre display is wrong. I reset the 'Trip' meter of the speedo [ which is in miles ] to zero & rest the centre display also, its set to Km's.

For each 0.1 mile on the speed the centre display changed by 0.1Km So every calculation is off by a factor of 1.6

even the average speed, which after driving for 10 mins at speeds of 40mph to 60mph should an average of 44kph

Is there any way to correct this calcualtion 'bug'? I know of a '03 1.8TS SW doing the same thing.
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Going off my MPG readout on the centre display, I would say my 20v is out by exactly the same amount, reading high though. Have not done the direct comparison of km to miles.
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My friend was getting depressed by this 22.9 mpg readout, now that he knows its 1.6 times better he is much happier
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Fitting 27" wheels should sort it out
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calculation , error , mpg

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