"Lindenwood, post: 376278,
I like numbers, so this just caught my attention :) .
Two questions:
1) Is it 3 or 4 times? That is a 33% difference :) . It depends on how low I go when I air down and also for comparison it would depend on the tire size and pressure you are going back to.
2) Do you really fill your tires up 3 times and take the near-empty tank out? I do 3 times because I do not want to be inconvenienced with running out of air in the middle of nowhere.
I only ask because I would be surprised if most folks go longer than two trips (1x re-inflation each, with maybe some dust-blowing and such) before refilling. I did 2 trips once with two days of blowing off a lot of dust each night to cook and also other around the shop projects and it still had a little left in the tank. So, 3 trips of just airing up is easy to do.
So, that $600 compared to a $150 tank* is really about 180 tires, or 45 wheeling trips, before you break even and the ARB wins the cost debate. At my rate it will take a few years to get to 45 trips.
Three final considerations, then:
1) Isn't the Powertank like $300+? Don't waste money on a power tank. Can your average bro reliably get a functional 10lb tank setup for $150? Getting a tank for $150 is easy, just go tot a gas supplier and buy a tank , get a regulator and hose. I paid $150 and a guy In our Reno OB club picked one up even cheaper.
If so, it is probably fair to also consider the occasional ARB Twins on sale for $450-500. (Also, of note, my Puma 12v is only ~90 secs slower for all 4 tires than an ARB Twin, but only costs about $250-275--the Smitty 5+ CFM compressor is in a similar arena for even cheaper).
2) Going back to the relatively extreme $600 to $150 comparison, we basically come down to folks evaluating how long they are willing to wait to make up the difference. If you wheel every weekend, and especially if you inflate other rigs' tires, even the ARB is going to pay for itself pretty quickly. If you wheel once a month by yourself (and never inflate pool toys or use air tools, it would indeed take years to make up that difference.
3) Finally, it is worth noting the convenience of having CO2 filled. I use $50/hr as my personal labor cost, and 20 minutes of my time running to the paintball or SCUBA shop nearly doubles the time-cost of a CO2 fillup. So, using the above example, I would be looking at ~25 trips--less, if I air others' tires-- before I broke even. If you use $50.00 as your personal time cost then you need to add that to air up time to right? For me a fill up takes maybe 15 minutes of my time I drop it off and pick it up and my gas supplier is 100 yards from where I work. I am adding a few more hoses and fittings to my set up and I think I will be able to air up 4 tires in less than 5 minutes time.
Just some thoughts :) .