with regards to private owned cars, id like to clarify that with regards to maintainance, cost up would be negligible to none i assume. my guess is since private cars wont be facing as much traffic as taxis, it can get a lot of cooling down compared with a taxi that has to go on traffic after traffic.

however id prefer not to still go with the lpg not only becoz of the tank in the trunk but becoz of reduction in optimization of power in your rpm bandwidth. what the heck am i saying? let's say u drive regularly under 3k rpms. you'd have an lpg guy tune your settings to conform with your under-3krpm-style of driving. with an emergency at hand or just a rush, try going let's say 5-7k rpms... observe the sparkplug color burn. i can only say this for the cheap lpg conversion kits. not the lpg kits with control units used for fuel injection. even worse for the naiadss 1st gen kit since lpg flow does not vary within rpm range.

but then again, lpg kits are for those who want to save up in fuel cost. but that's just not me.