Dapat pwede same principle naman with a car engine. Sulit kaya? Assuming 20,000 ang conversion, do you use your generator enough to recover your cost? Pero, kung ordinary kitchen lpg tank ang gamit, baka mas mura ang conversion.
The LPG genset I saw had a small kitchen LPG tank as it's source.
BTW, you don't need to use a car sized LPG conversion kit... one make for a motorbike or even a home made nozzle with regulator would be enough since the genset runs at a constant speed.