How many miles do you have on your car and what year is it? Whatever issues your vehicle has hidden will likely start to show up after 1500 miles if it has over 50,000 miles. It reads like your car is not new. 1500 miles on a new car is nothing. 1500 miles on a car with over 50,000 miles might be a different story.
Do you still have a warranty on your vehicle? If so, him putting that much mileage on your car in so short a period of time could really truncate the service or raise the cost of service you receive for a repair that 1500 miles earlier would have been under warranty. That's not a little thing, at all. I once had to have an entire transmission replaced, very expensive, but still under warranty, so my cost? Zero. Warranties can be very important. Running them out faster is a cost risk.
What about your car insurance? Dependent upon the policy, vehicle insurers can dun their customers for excess mileage.
Wear and tear on tires, how new or old are your tires? Fluids? After 1500 miles you might want to see if you need an oil change, not earth shattering, but a cost nonetheless, as are steering or brake fluid if you have not had them replaced recently.
Is there a note on the vehicle? Does joint income pay it? Do you each pay for repairs on your vehicles separately or from joint funds?
It's a hobby, not a career, by definition, he can miss it more than once. Come to an arrangement that cuts the mileage to one third if you have any concerns about the issues above.