When filling up with LPG, is the tank 'purged', thus losing whatever gas left in the tank? If so, is it a case of 'use it or lose it', or is the gas recycled back into your tank and you get credited for the quantity?

No it's just refilled, there is no purging only an over pressure safety release valve but since the pressure is low anyway it does not activate unless they over-fill which is difficult for them to do since there is also a high back pressure setting on the fill valve which is set slightly lower then the tanks over-fill pressure..

just didn't want to open another thread... but is there any way i can buy lpg kit with credit card for 10 months installment?

thanks.

I guess that is dealer to dealer question isn't it? some may and some may not, you just have to shop it around yes?

There's a Thai company called Versus Thailand - they have a website - I don't know when they were formed but they've certainly expanded and have shops all over Thailand suddenly Bangkok-Chiang Mai. Until the 31st they've got a promotion on LPG installation and offer 0%/10 month on credit cards. I think there must be something behind this push; it's long been speculated if/when the LPG subsidy will be altered, as particularly as LPG grew in popularity after 2008, this now seems inevitable, due to the costs involved and the rate at which the fuel fund is being depleted. The government is backing NGV (subsidized still but not as much as LPG), all new bi-fuel cars come with NGV none with LPG, where as if you look at the global situation LPG is the more established gas for transportation. Yet with the subsidy removed or even just reduced it wouldn't be economically viable. It's worth discussing this again as the arguments held in 2007-8-era threads are no longer valid and different problems are faced.

There's a Thai company called Versus Thailand - they have a website - I don't know when they were formed but they've certainly expanded and have shops all over Thailand suddenly Bangkok-Chiang Mai. Until the 31st they've got a promotion on LPG installation and offer 0%/10 month on credit cards. I think there must be something behind this push; it's long been speculated if/when the LPG subsidy will be altered, as particularly as LPG grew in popularity after 2008, this now seems inevitable, due to the costs involved and the rate at which the fuel fund is being depleted. The government is backing NGV (subsidized still but not as much as LPG), all new bi-fuel cars come with NGV none with LPG, where as if you look at the global situation LPG is the more established gas for transportation. Yet with the subsidy removed or even just reduced it wouldn't be economically viable. It's worth discussing this again as the arguments held in 2007-8-era threads are no longer valid and different problems are faced.

hi, thanks so much. your information is correct. I just called the company and they confirmed me about the Kbank credit card promotion. however, it is quite expensive at 30K whereas i could easily get it at 24k in other shop.

my car is old and 2.0 cc. i don't have plan to change my car and would drive at least for next 3 years.

so wondering is LPG or NGV good for me. i'll drive in Bangkok city.

i don't have any idea bout NGV.

thanks.

Under your circumstances with an older car and less time of planned ownership I might give the nod to LPG, a newer car to NG..