We've done dozens of these tanks in the last year, some more than once-many repeaters after only 8-10k miles. To a man, each owner swears he is running only good fuel! It's starting to get ugly with this issue...and now with the ssm about the new tank, with "a greater robustness to bio-diesel", we are sure to soon see these guys back here, looking for a refund and/or a new tank. This will be only a temporary band-aid for the real problem, whatever that may be-Ford stands by its 5% bio max rule, so this will not be the end.