as someone who has intentionally jumped a car at over 80mph I can tell you, they drop a LOT faster than you'd think.
imagine if you will the following road

at the crest is a railroad track. many many dumb fools took the jump going left to right, because the road is a good mile before the tracks. many many dumb fools put grooves in the concrete on the right "uphill" part where their car bottomed out.
we learned about this from an upperclassman in high school. he had a Polaroid of his VW Jetta about 6 feet off the ground jumping over a guy lying in the road

(that was a right to left jump)
if you look from above the tracks were about 1/3 mile from a turn

I hit this multiple times from both directions in my 1980 Monte Carlo to much fun, and damage to the car especially the time I like many other morons landed on the uphill from the left to the right. that time I was about 70 when I hit it.
so one genius night my buddy in his Mitsubishi Eclipse decided we'd hit it, with me in the passenger, another friend in the back seat. I should mention the street running from top to bottom is one of the biggest downhills I have ever driven personally. about 2 miles from this spot it must drop 500 feet in a short distance. the fastest I have ever drive is the bottom, about 125 I am guessing as my speedometer stopped at 80, and I went around back to the 10 MPH.
So we hit it a few times in prep for the big event, both ways, feeling out what we'd do, and guessing our landing spot. Thinking that the small incline coming from left to right wouldn't get us past the incline even with a mile run up we concentrated on how to get speed in the short run from the right.
For fun we raced down that big hill I mentioned, the slowed down and practiced taking that turn as fast as possible, using wrong lanes and all, blind corner, MAN that was just part of the stupidity happening 3 AM that night.
We went around the corner at best about 35, and gunned it. we hit just over 90mph.
You'd never think the uneven distribution of passenger weight in a car would make it tilt in air. The rear passenger was on the passenger (right) side.
We cleared almost the whole span on the left, but did land on the uphill... first thing to touch back down? the front right tire, by a LOT. it threw the steering wheel to the right, snapped a tie rod, and thank God the driver slammed the gas and yanked left. We were dead center of the road when we hit, and when we finally got control of the car we had hit the ground, careened into the tiny shoulder on the right, missed a telephone pole by 5 feet, skidded to the left shoulder, made tire marks in someone's lawn, and left some metal and oil on the road.
Sorry but the worst that happened was the rear passenger had a bump on his head from hitting the ceiling for about a week. Yes not a single one of us had a seat belt on either.
That was 1992 and I have never considered "jumping" a passenger car since.
Scene of the crime:
http://maps.google.com/maps?client=firefox-a&hl=en&ie=UTF8&ll=43.128391,-88.134902&spn=0.000469,0.001695&t=h&z=20&om=0 they have since re-paved the road, and even trying you can't get air anyway.