Only had one petrol hire car out of probably 15. More economical innit seeing as people generally use hire cars to go on long trips. Doubt I’d have got 62mpg out of a petrol car doing a steady 90 up the M40 last week.
The diesel ones always have had a big yellow tag that says DIESEL on them. I’m sure the petrol one had nothing, as though the default fuel to put in a car is petrol but for diesel you need to be told.