I rebuilt evaporator and tuned the system in 2016 so was getting 17-19L/100km (2.2t truck)
Apparently rubber membranes are deteriorating over time..
LPG is much more expensive now but still it's cheaper to run the car than on petrol.
I was driving on petrol for a year or so when petrol was around $1 mark..
I have the 3rzfe, with Emer gas injection. I had it put on in 2011, and I don't know how much I've saved in that 10 years. Just recently, I had to get the tank checked and recertified, that cost about $250. It still runs like a clock, I get about 400klm out of a tank of gas at about $40 to fill it,