Best way to auto grind upto level 30 a spec or 35 b spec

[danterzza]

Well I want a red bull x1 and can't be bothered playing for years to get my xp up. I am level 25 a spec and 26 b spec and have saved about 10 mil. What's the best car to auto grind?? That can win easily to get me some xp and more credits??

Thanks dan