Roy GS

I'm running a 2002 GS300 with LPG at the moment, I used to have the RX300 which on normal driving wasn't very good on fuel. I used to do a lot of miles. I've been looking at the RX400H because of the 30+ MPG. I'm not sure where I saw it, it might have been on here, but there was a guy who put a range extender battery from a Tesla in his wheel well, which is pretty much the same as an LPG tank, and he tripled his mpg. I was wondering if anybody on here had seen his post and could they repost it. Thanks.

My previous GS300 was on 198000 miles when I sold it.It was 1998 GS300 with Prins system and Stako tank. I saw it on Ebay about 2 years later with 220000 miles, almost the same price I sold it for. I now have a 2002 GS300 with a BRC system. The first one I had easily did 100000 on LPG, I had it for about 5/6 years, the engine oil was gold when I bought it, and didn't change oil at all, stayed the same colour. The one I have now had LPG fitted when I bought it with 50000 miles on the clock, no flash lube on it, and its now on almost 90000, same oil. Only problem I've had is gearbox oil, which has nothing to do with LPG.