The one video said such an "air car" could be filled up in about 3 minutes.
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Which means they are swapping tanks. Theres no compressor that could safely fill something like that in that time period at that pressure.
100 kph=62mph Not really deathly slow on the highway. Even if that is the final top speed of such a car and you were on a 70mph interstate you should be okay.
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I take it you've never driven on an American highway... Drive the speedlimit and your gonna get flattened. If your not doing 75 in a 70 expect to get mowed down.
I don't feel safe doing 55 in a 55 in this area. Keep in mind mileage on these vehicles also typically does not indicate top speed.
Ill lay down a bet... Youll never see one of these cars manufacturing.. the green lobby will claim conspiracy.. but the reality is just like anything else theres prolly some niggle that causes a fly in the ointment. This isn't utopia, you don't get something for nothing.