Dear My average use of fuel per month is 150 litters or 2000 km/month and my car is vitz whose millage is 13.5 km/l which mean if i use vitz for 60 months the cost of fuel will be
average millage 12 km/l for 60 months (as after 36 months average shall be dropped) therefore average use of petrol will increase to 160 litters / month
average fuel cost for 60 months shall be Rs.120 as of today it is Rs.105
160 (average litters) * 60 (months) = 9600 (total litters)
9600 (total litters) * 120 (average cost of fuel) = Rs.1152000 (total expense on petrol for 60 months)
Now for pirus
Average of pirus is 22-23 km/litters (as i have drive the car and note the millage multiple times )
2000 km/month and average millage for 60 months shall be 19.5 km/litter
2000 (km/month) / 19.5 (km/litter) = 102.5 (litters / month)
102.5 (litters / month) * 60 (month) = 6150 (total litters)
6150 (total litters) * 120 (average cost of fuel) = Rs.738000 (total expense on petrol for 60 months)
Therefore my dear friends you are saving Rs.1152000 - Rs.738000 = Rs.414000
Battery cost after 60 months shall be decrease more commonly used example vitz parts are very expensive 5-6 years before and now the price reduce around 30%
So battery cost shall be Rs.250000
414000(saving) - 250000(battery cost) = 164000 (total saving) and you car is good for another 3-4 years
all above calculations are on 60 month old prius, that's why i have calculate it for another 60 month because battery can live up to 120 months easily.
if you buy 36 months old prius than calculation will different as then u have to calculate it 74 months means more saving.