In the roller coaster stage, I tried to use Tank, Kiddie express and Jeep but none of them went farther than 964m. Which vehicle is suitable for this stage?
My personal best is 3991m with the Dragster. The key is a vehicle that can get up the very steep inclines - vehicles with down force like the Dragster, Race Car, or Rally Car are all effective. Use whichever of those 3 you have the most upgraded.
Of course snow mobile. I got 3515
I like the motorcross bike. You don't have to hold the gas the whole time. It is best if you have it maxed on everything.
Rally car, 8229m. Mind you, it was almost fully upgraded (everything except tyres).
I used the Hovercraft maxed out. It climbs all hills, but gas sucks.