Thanks GH and SS! Galeng nyo talaga.

Some months back, when I was having my radiator fixed at Denso Makati, they were experimenting on converting a Corolla to LPG. Koreans were doing the job, and Vincent (owner) told me it was a closed-loop system. I didn't know if that technology has boomed, and has become widely available and more affordable.

I will now read through the long Avanza thread, and check out if there are any users out there with LPG converted units. I'm planning for an everyday car, and I'd like it to be LPG-powered. Avanza might be worth looking into, but I'm still open to getting a 2nd hand car and have it converted.