Hi Phenomenon, thanks for the advice about running the Aveo on LPG. My car is still under Chevrolet warranty so I may wait before doing any conversion, please do let me know or PM me about the company you recommend.
I only drive 40km/day, but I looked at an LPG company called 'Versus' as they are nationwide, but when I saw the way the car is converted, I changed my mind; the filling cap sticks out under the boot and it doesn't look very safe. Also, the Thai government plans to float the price of LPG to around 18baht this year, or so I read. Between this price rise, the LPG maintenance costs, the lower economy and the fact that you need to start the car on petrol every time, I'm not sure how much I'd save on 40km/day.
I did find those E85 conversion kits but as you point out, there are very few E85 stations.