Its been a while, and there is a good reason for that, just like how there is a good reason why there is no other KZfaq video with anyone using the Phantom on the expert track with the Phantom as far as I know at the time of upload. This is a MASSIVE step up in difficulty from advanced gran prix.
Despite the fact that tires wear faster while drifting, you have to drift a lot using the Phantom, because that's how you take turns fast with it, at least for high speed corners. For corners you take at 230 kph (about 137 mph) and lower, however, you can take them without drifting with minimal time loss, so you'll want to do that to preserve your tires, and also shift to 1st and then quickly back to 4th in the middle/near the end of a corner so you can drift for only a part of those corners and get some sweet mini Scud Race drift exit boost upon corner exit.
The Phantom can still take most corners pretty fast even with worn tires, but that doesn't mean you don't have to take tire wear into consideration. You probably will want to take some corners more slowly with worn tires, most notably, the park 270 and to a lesser extent, but still surprising, the non-downhill tunnel corner.
You have to keep the gas mostly floored to go fast while drifting, so there's no way you will be able to save enough gas by coasting a lot so you can pit on lap 6; so don't worry about conserving gas.
I also have some other tips. If you are having trouble getting the Phantom to drift, keep the gas floored while in 2nd, and then shift into 4th when necessary; and that leads into my next point. When you want to gain speed while drifting, shift to 4th, and then downshift after you exit the drift if necessary. You can also rapidly shift from 4th to 2nd and back to 4th while drifting to make it so you can keep a mostly stable speed while holding accel so you can more easily stay in the drift. This is most useful as an in-between for full throttle drifting and no throttle drifting.