It was a low-horsepower car, the second you start going up the ramp your kinetic energy is being converted into potential energy, meaning you're very likely to slow down, a lot. Wind resistance and friction are very high at those speeds which mean that you'd have to have an insanely powerful car not to lose a lot of speed as the ramp-climbing sucked your energy away. Once you get to the top, you lose the power to accelerate, so the air resistance that comes from a big blocky car moving through the air is going to sink you fast. Even if you made it to the end of the ramp at a high rate of speed, you're not going to manage a parabolic leap, it's gonna get truncated. So unless the gap is very short, you're screwed.