I should really double check my info. Not only the R500 doesn't have any multiplier... but the 205 too.
So the M6 is the only car with drift skill boost that have the 7x (since the Merc also lack the multi perk). Don't know about the Capri (also a skill boost) since that is the only FE car I don't have. The Renault 5 does have the 7x. I double checked that!
I do wonder one thing... Why on Earth the developers decided to put an 8x multiplier on the Peel!
Probably.
Again, Don Joewon Song said the M6 FE is the best for pure farming and the runner up is the Hoonicorn. I'm sure he has investigated all the perk trees of all the FE cars and all the interesting legendary cars.
I didn't have the time to fully experiment with this subject yesterday (damn Assassins Creed Odyssey is awesome as well and partially keeps me away from FH4) but I did manage to accumulate enough skill points from 2 Forzathons and a little bit of skill song grinding (with the Aventador FE
) to get the Focus RS RX to have all perks unlocked apart from the 25-cost one to not break a chain, I still gotta get that one since I'm a destroyer of great skill chains with my over-the-top nutcase behavior.
It's also still in the stock tune for now but damn that multiplier to build chains 3 times as fast (and to 7) is really great, my Aventador doesn't have that I think, only twice as fast IIRC. But the thing is, for pure farming it's actually not that great since you get to 7 really quick but then stay there a while to gather more points before cashing in. So in a way it's also a useless perk similar to the wheelspins (again, for pure farming intentions). However, for Forzathons where you don't just farm but also participate in the events and drive around I think this is really great. I think that Focus RS RX further tuned towards X-class can be a Forzathon beast. Whatever tune you give it (street, dirt, drift) it will excel at all off road events and skill point events. Its only Forzathon weakness I can think about is probably high velocity speed zones & speed traps. You can decide to swap to a hypercar for these (meh) or simply just do them with the Focus anyway (for lazy me).
I just checked in-game and the Hoonicorn and Focus RS RX have the exact same skill perk tree. Don Joewon song probably perfers the Hoonicorn since he likes the car so much and it's faster than the Focus. I never played with the Hoonicorn that much to be honest since it was introduced in FH3 so late in the game's lifespan (even after Hot Wheels IIRC), the Focus RS RX came much earlier with Blizzard Mountain. In the end just for looks and gameplay I prefer the Focus, I enjoy watching rallycross IRL too.
But I will give the Hoonicorn a try too once I have it fully upgraded.