I had to look up what nickels and dimes were. I knew they were American coins but couldn't get to their values.

I remember shillings and pennies and converting to decimal (one shilling became 5p in the UK) but can't really remember what they bought then.

I can put a later price on petrol as I had a weekend job as a forecourt attendant when I was around 16/17, say 1976/77. It was around 75p a UK gallon then. Talk at one time used to speculate on petrol reaching £1 a gallon. It's long been over that for a litre, very loosely speaking, a fifth as much.