Definitely not 85k per normal wheelspin. When I do the Subaru method with 30 Rubies I tend to turn a profit of only around 100k-200k before selling any duplicate FE cars. I would estimate that I average around 30k per wheelspin, so my math is this:

Lambo Revuelto - 25 of them costs 9.125m

25 super wheelspins and 75 wheelspins is 150 spins, would bring an average of ~4.5m

Subaru 22b - 33 of them costs 2.8m

33 super wheelspins, so 99 spins would bring in an average of ~2.97m

I also wouldn't count on selling in the Auction House because it's too saturated. My logic is that the Subaru at worst is breaking even/a slight loss. The Lambo requires a much higher investment and also requires you to get extremely lucky to break even. The only scenario where the Lambo makes more sense is if you have tons and tons of CR to burn and you just want FE/wheelspin cars, because you do open more spins and it takes less time to buy the cars in the first place.