...going on a long weekend trip, and popping into a pub on the way back to collect more oil than used on the trip 
That's good news - collecting more on a trip than you burn is always a nice feeling
I had a happy moment the other night.
Went to the fish and chip shop for my monthly collection - just over 200 litres of rock solid palm oil.
I took my wife and daughter with me as it was dinner time.
I order large cod and chips for me, two battered sausages and large chips for Tash and a single sausage with normal chips for Alicia
At their menu prices, that was nearly £15. The price the lady in the shop asked me for . . . £6.80

That makes paying for palm oil much less of a bitter pill.
Further happiness tonight was the best part of an hour in a very hot bath, heated by that palm oil (and with a couple of cans of cider for company)