My first car was a 3.4 litre Jaguar Mark VII.
It was 11 years old, and acquired in 1963, with >100,000 miles on it; I passed my test at 22 in 1960 in a 998cc(?) Ford Escort. The Jaguar was well used and initially very poor on fuel giving around 11-12mpg. I put in a lot of time working on it, and after cleaning the filthy air-filter, and renewing the SU carburreter jets etc., getting the brakes off by going back to the correct brake master cylinder, I got it up to 22mpg. Great fun, but sadly on a drive through Yugoslavia in 1965 its big ends failed, and I had to give it away to the Yugo Customs - otherwise I would have been fined the import duty as on a new car! Earlier in 1964 I drove it from Hendon to Preston in 3h 30m cruising at around 95-97mph; that was when our few motorways did not have speed limits. On getting to Preston I checked the oil and it needed 2 gallons in the 3 gallon sump. Great fun, but it didn't last. My next car was a Hillman Imp bought new - pure rubbish...