I would say it's possible if:
- He drives longer trips that allow the engine to warm up and stay that way for an extended period.
- The roads he travels on are flat, and don't have a lot of traffic lights/stop signs.
- He accelerates from a stop gingerly.
- Once he gets going on these roads, he holds his speed at 60 mph or less.
- It wouldn't hurt if he fills with no-ethanol gas.