Sunday I went out for a drive in the wreck, I had the manometer inlet setup under the front of the chassis. I ran it up to about 90-100mph and recorded the readings. At the peak it translated to about 386 lbs. of pressure lifting up on the front wheels. I was going to try it at a bit more speed but had a Milodon 'green gasket' failure. Thankfully it didn't totally blow out but it did pump 2-3 quarts all over the underside of the truck. I've got to make up some kind of air dam.Dave