Well, I have but it runs out this year in summer,
I also found something like that " Converting a vehicle to run on Autogas may affect any warranty you have in place from the manufacturer, however this can often be supported by a new warranty offered by Liquid Gas UK Approved Autogas Installers and Accredited Distributors. "
I will have my service soon so I will ask my Toyota/Lexus dealer about warranty and LPG
then some more research in the subject after that depends how far I have to go for conversion will make final decision.
I am not really brave but I think there is a lot of myths about LPG 😄