Did that to the school minibus coming back from Snowdome- tank was almost empty. Same minibus, same colour, same seats, same everything - but on that day they told me to take the boarding house minibus instead of the one I usually took! I am used to driving both Diesel and petrol, and all sizes- and normally I would have felt the difference immediately when driving- but nope!

And no-one had the idea to tell me, and no sticker to say so inside petrol cap or on the dash. Expensive- had to be drained and steam cleaned!