The computation that factors in the price of the car would be total cost of ownership. If TS is only interested in the fuel economy then he just need the real world km/liter reading of the car. But total cost of ownership is the more logical way to look at costs savings.

To make the total cost of ownership more accurate you'll have to factor in also the maintenance costs. Like in Hyundai forum they said you have to go for maintenance every 3 months or they will void the warranty, hence you have a quarterly recurring expense.

Sent from my mind using Telepathy 2