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When you configure a smaller displacement engine to provide both power and economy then the driver has the ability to improve mileage if they change their driving habits to increase overall efficiency.
If they drive the same way as they did with the larger displacement engine then any gains are probably negligible. I would love to see what the 1 liter engine would do in my Fiesta, but that will probably be a long time since it will have to be a rebuilt 2014 Fiesta. I would guess that I could average 50 MPG versus my present 45.5, maybe better.
regards
Mech
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