That would depend how far you drive though right? I drive 5000 kms a month
If he needed 3 cars to make it worthwile, I guess they didn't drive far. The pumps were quickly floating around for reasonable purchase within a couple years (leasing co.'s dumping off-lease units). The low pressure was a govt safety concession. I still see a whack of big v8's with the CNG warning labels on the back bumpers driving around. Either way, it's all on the economy. So folks are just plain freaked out having a pressurized anything strapped to their cars. I know there was some fear-mongering going on (you'll go up like a roman candle if you're even in a small collision!!).
Andy