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A grill block may also help speed up the warming. To get higher FE, I had to use more neutral coasting and dancing around my DFCO point plus pulsing the throttle to keep around the optimum speed/rpm. Scangauge helps but not necessary if you know your car's habits and limits already.
My 7mi summer trips made getting 40+mpg a chore, mostly because 80% of that was in city.
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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