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It is something that cannot be determined by country of origin,
There are many factors which affect the fuel economy irrespective of the automaker
1. DISPLACEMENT
2. WEIGHT
3,DRIVING STYLE
4.AGE OF VEHICLE
5.MAINTANENCE
ALL THE ABOVE FACTORS ARE TAKEN INTO ACCOUNT WHILE TESTING FUEL ECONOMY.
You cant give a simple answer to it and it depends from car to car. I think both of them are doing a good job.
But if you ask about durability, I think japanese will still take the lead as they have been in the market a lot longer than korean companies have.
I choose japanese cars , because of her injection system
little difference in the fuel efficiency,by the technology wise there is not much difference between Korean and Japan, what matters is the parts availability and the after service options
When referred to fuel efficient East is efficient and not the West. Japanese and Korean belong to East and aimed at Fuel Efficient and therefore light weight based. West usefully keen on safety and comfort and therefore material used in the vehicle causes weight and strong and Fuel Efficiency comes as last. Both American and European vehicles are comes under west. Korean follows the leader Japanese.