Well I know this has been discussed before due to the pessimistic fuel gauge.
After filling up on sunday for the ride down to Hereford (two up) I had 200 pre miles on the clock. I used it into work on monday with the reserve light flashing which I know is good for at least 50 miles but I still only get 20 odd litres in come fill up time. So this time I fill a one litre container and strapped it on the back for the trip into work yesterday. I expected to run out on the way back but still made it home! Filled up this morning with 313 miles on the clock and the tank took 23 litres so ne question answered ie it definitely is a 23 tank! 62 mpg.

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