there is no reason to expect LPG not to go through the same "shortage" as soon as it became more popular.
your Honda might run perfectly, but that gallon of LPG at 2.22 a gal will not go as many miles as a gallon of Gasoline.

it used to be a fairly common thing for the conversion, and most every LPG wholesale company had a shop doing the conversions, after C.A.R.B. got involved it got a lot more complicated to do a conversion and get the needed certifications. it also was a lot more obvious about the differences in power (at 70 HP and you loose 2% of your power, you didn't even loose 2 HP, but at 300HP, the loosing 2% is a more noticeable 6 HP). (and 2% is just a guess)
cheaper fuel is not less expensive unless it produces the same BTUs/HP/KVW (amount of work) for the LESS $, (not the same $)

one of the things I have noticed about the change was that "dual fuel" (LPG or Gasoline) really works now. I used to think was a cruel joke on forklift techs, (the switch only shut off one fuel or the other, and made no changes to timing or spark gap) and when CARB came out, dual fuel really worked, but almost no one wanted to purchase a gasoline powered truck anymore, only LPG...