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If I'm not mistaken, there is a mod for this, because I used a awd 4ws Rally Pessima, I just don't remember the name of the mod
It's configurated correctly because all the other games use the Dedicated GPU, only Beamng don't.
I play BeamNG in my laptop for a while (a MSI Gs70 Stealth) and suddenly, when I open it through the Steam it uses the integrated graphics intead...
I think it should have an modern hatchback, and more powerfull sedans, with big engines!