Re: MPG at 40-45 MPH Reply #50 – July 29, 2012, 08:09:04 pm Here is an answer (sort of) to my question about using CO2 for tire inflation. The question was.... does the carbonic acid which forms from CO2 and water have the potential to harm tires and the aluminum wheels on FT coaches? I contacted Power Tank who is a major supplier of CO2 tire inflation systems (POWERTANK - CO2 Air Systems) and this is the response I got tonight."Hi George- Yes, this questions has come up before. Carbonic acid is a mild alkalyd and nothing to worry about. Dog pee is more corrosive than this. In the 15 year history of Power Tank we have had no reported incidents of tire or wheel failure by a Power Tank user. Steve Sasaki, Power Tank"Not sure what an "alkalyd" is (it is weak acid in chemical terms), but he does have a point. No more dog pee in the tires! Quote Selected