On that particular test we had done 280 miles and used 31.03 litres (= 6.83 gallons) which equates to 41.02mpg
If as you say the fuel gauge is somewhat iffy that would mean I could have gone for a further 100 miles (43litres = 9.46 gallons @ 40 mpg = 380 miles).
Would you have carried on with the fuel warning light flashing and the fuel gauge showing empty for a further 100 miles. Surely the fuel gauge can't be that far out.
Interestingly on our previous Morgan a 3.7 Roadster the fuel gauge and miles left indicator were extremely accurate, I would have trusted them with my life!
