Probably nothing wrong at all, just the cars calculation method.
We often joke that ours makes fuel as the range indicator can increase easily by 50 to 70 miles on a longer, steady journey for quite some while.
We reckon it depends on the previous few days trips, especially if they have been short urban types.
On a recent 160 mile each way round trip to South London, via A46, M1 and M25 with accidents, roadworks and simply traffic keeping the speed steadyish between 60 to 70 and starting with a full tank, the range increased from 615 to almost 900 miles and this hardly budged virtually until we arrived and hit urban traffic!
The tank bars mirrored this, but of course the instant consumption was varying between 90 and 20mpg!
The next weekend we did a trip of 200 miles to Shuttleworth and back with a similar result, though not so wildly optimistic. On return the gauge was finally at 3 bars with 230 on the range, filled to the brim with 48 litres, works out at 49.3mpg, so about correct in the end.
Our car is a 6 speed manual and is difficult to get in top at those speeds, however has produced similar economies in previous trips such as across the Alps, when driven "gently", well sort of!
At 35k miles and so far none of those nasty engine problems in the mix, its just another of those little irksome items on the list that mar the overall great picture!
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