I need new pants too. My old Diablo heat pants from 2004 have a tiny little tear in the knee
Depending on the gun and tank the LP may not be an issue.
If the recharge rate on your tanks regulator is fast enough you won't notice any real difference. If the recharge rate isn't fast enough, you may experience shootdown at high rates of fire.
Using LP on an HP gun may "starve" the marker for air. It won't shoot right, won't chrono right, and will be inconsistent.
Again, that all depends on the recharge rate of your regulator. I know crossfire regs are phenomenal, as are Ninja and Guerrilla Air. If you have 1 of those 3 tanks you should be fine.
Ha ha ha, the only hobby that is more expensive than paintball is tinkering with cars and trucks. I dunno if I could afford to do that. However I would LOVE to build a Rat Rod, if I had the time and money to do so.