good question - im not really sure.
i havent really used it as much.
its pretty good thou, when i bought it i put £30 of diesel in it,
did just over 200 miles and still had about a quarter of a tank left.
Normally i put about £40 of diesel in it and it lasts me over a month.
as i only drive it if i need to, as i also have my golf diesel for my daily missions.
I would say they must be good, as transit are everywhere.
probably someone by you must have one some where.
Nearly all builder be using them. so therefore i assume the must be good.