Disable Autosave?

Is it possible to turn off Autosave in Forza Horizon 2?

Or in fact, in FM3, 4, 5, or FH1.

I am currently building all my garages to 300+ cars in readiness for Forza 6, and the autosave after every car purchase is taking up a lot of time.

I don’t believe the developers would remove autosave. I think they have that in case someone discovers some glitch in the Autoshow process and happens to know how to exploit it. Either that or for crash insurance.