[oil pan 4]

I know I'm grave digging this post.
I ran some numbers and they look so bad I hope they are wrong.

To supply the 10 horsepower needed to power a car at 55mph it looks like it would take up to 700cfm at 90 psi.
To compress 700cfm to 90psi my engineering tool box calculator says that will take 106 horsepower with a single stage, about 10% less for 2 stage and a little less for 3 stage.
(this is not the requirement for compressing it to storage tank pressure of 2000 to 3000 psi)
Then add 15% to 20% to over come friction.
I know the air compressor power requirement numbers are correct, those are already well established.

So we are looking at about 10% efficiency.
If 2 or 3 stages of current turbines were sized properly and connected in serries the efficiency might get up in the 15% to 20% range and that is with me being overly optimistic.

This requirements I found were likely for a current air turbine type motor, which aren't real efficient. So these guys building the air powered cars have to come up with something vastly improved over current air motors.
It has to beat current 200 year old technology by leaps and bounds.
If these companies could make their single stage turbine 10 times more efficient than current ones I still dont see a vehicle going very far even then. I think they could make a real good, real cheap, very low maintenance, all mechanical short distance vehicle.

I hope they can do it, it just ain't looking good.

The compressed air powered vehicle videos I have seen they were showing off NEV or golf cart like performance.