I use a CO2 Power Tank, but the tire refill times are over exaggerated. I've time filling my 35" tires and it is between 65 and 70 seconds to go from 15 to 45 psi.
I have done some research and found that CO2 will diffuse through tires. Bike tires go down overnight, but I haven't noticed any measurable leakage through my KM2's or Cooper STT's. Maybe after a month or two you have to top off, I’m not certain.
The only downside is the cost of a fill is $20 and you have to remember to refill it when it gets low.
A CO2 tank is much more reliable than an electric compressor and won’t drain your battery. Many compressors will draw more power than your alternator will produce, especially at idle. :whaa:
Also, when you refill at most shops the tank has to be empty and then allowed to warm back up, which takes an hour, so empty it the night before. I usually fill my tires and then anybody else who need it and then refill before the next trip. I can fill about 23 to 25 tires on my 10 lb tank.
I have no financial affiliation with Power Tank and I don't receive any commissions from Expedition Hardware or any other Power Tank distributor for my comments (although I'd like to). Your mileage may vary. Don't try this at home! I'm a trained professional and I have a BS degree!