It CAN mean that, but it doesn't have to. His use was appropriate, see #2 and/or #4 below. It just wasn't what the definition #3 as you expected it to be.Ed753 said:
mile·age /ˈmaɪlɪdʒ/ Pronunciation Key - Show Spelled Pronunciation[mahy-lij] Pronunciation Key - Show IPA Pronunciation
–noun 1. the aggregate number of miles traveled over in a given time.
2. length, extent, or distance in miles.
3. the number of miles or the average distance that a vehicle can travel on a specified quantity of fuel: the car gets good mileage.
4. wear, use, advantage, or profit: She won't get much more mileage out of this old coat.
5. an allowance for traveling expenses at a fixed rate per mile: His mileage came to $90.
6. a fixed charge per mile, as for railroad transportation.
In answer to the OP's question, I've got the stock Crapyears. I've put about 33000 on them so far. They're not too bad yet. I might get another 5 k out of them.