My 1260 regularly returns 50+mpg over the tank full the worst i have had was low 40s on a mental blast from Invergarry to Eilean Donan
The worst thing is the range indicator which is way off track. It tells me i have 20 miles range which should be about 2 L in the tank and yet when i brim it it only takes 14L in a 20L tank ....
So having said all that the trip computer could be a load of shit and its doing nothing like 50mpg
Perhaps measure it full to full and record the miles between & come back and tell us
On board mpg can be notoriously optimistic



