In the last 30 years the highest mileage car rented was from San Diego was a Toyota with about 15,000 miles on it. Well it ran like heck. In exchange got a midsize Buick with slightly less mileage, but ran much better, but not great. Try to get rental cars with under 15,000 miles on the clock.
I traveled to the UK frequently and rented cars from Heathrow, usually from Avis. I rented a near new Fiat, great car, low mileage. The engine seized about 30 miles from the airport. Before you rip me a new one, I drive carefully and don't abuse the rentals. Avis did come and get me quickly and get me into another rental. Unfortunately it was the GM UK equivalent of the Cobalt/Chevette in need of a front end alignment. It had close to 15,000 miles on it.
Whimsey
I traveled to the UK frequently and rented cars from Heathrow, usually from Avis. I rented a near new Fiat, great car, low mileage. The engine seized about 30 miles from the airport. Before you rip me a new one, I drive carefully and don't abuse the rentals. Avis did come and get me quickly and get me into another rental. Unfortunately it was the GM UK equivalent of the Cobalt/Chevette in need of a front end alignment. It had close to 15,000 miles on it.
Whimsey