I didn't manage to travel 1000 miles on a single tank of diesel in my Seat Leon Ecomotive. I failed.
But flip the question and ask how many miles can you do on a single tank of diesel, then the answer - 925 - is pretty darn impressive.
The inevitable happened at 1.34pm just before J11 on the southbound M40, just outside Prodrive HQ in fact. But this was much further than I thought we'd get an hour earlier when the fuel gauge clicked over to zero; the M6, M6 Toll, M42 and a part of the M40 all came and went before the Leon finally gave up.