i drive somewhere in between 16.000 - 20.000 km per year. Lpg is about 1 euro and euro95 is about 2,30 euro. the mileage on petrol is probably better than on lpg, but i do get an average of 13.5 km on 1 liter lpg (duster 2019 1.6 engine). The road tax on lpg cars is 200 euro more compared to a petrol (euro95) car, but if i add everything up i save around 1100 euro's a year. But the availability of lpg is good compared what i read in this thread. At worse i have to drive 2 km to a gas station that has lpg, luckily it is nearby because of the small factory fitted 40 liter tank which fills up to about 32 liters of lpg. So i need to fill up the tank twice a week. That's the online downside of the lpg system that dacia fitted, i would have preferred a 70 liter tank that was also fitted (aftermarket) on my old duster.
so, a lpg gas station nearby or on the way to work makes it definitely worth to go for bifuel.