Doing a simple computation...
42.8L * P42/L = P1800 (your one week's worth of gasoline)
42.8L * P28/L = P1200 (your equivalent week's worth of fuel if using LPG)
... or about P600 savings for every week's of fuel.
Assuming you save P600 every week and an LPG conversion costs P28,000, it would take you 11.67 months to recover the cost of your LPG conversion. This assumes the price difference between gasoline and LPG is relatively stable. (With my car, I had an estimated ROI time of 12 to 14 months and the actual ROI period was achieved in 11 months.)
Even if public transport is cheaper than driving your own vehicle, it is not free. Although driving one's own vehicle is more costly than taking public transport, it is difficult to assess the value of the convinence, relative safety and comfort of having one's own vehicle when traveling between home, work, school, etc.
As for the shifting price of LPG, yes it does go up and down during the year. This goes hand in hand with the world demand for heating fuel especially those in colder climates. But as winter ends, the price does go down. I have experienced this during the first year I had my car on LPG.





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