Wow, that is interesting. I can only speak from my own experiences with the Scion XA (automatic) and when I go to N from 45 (since that's where I usually drive at) my RPMs take a dive from 1800-1900 down to 700-900. MPG gains are immediate (instant and current trip) but I'm trying to get into the habit of DFCO coast first then N-coast once I'm below the minimum 1200-1400 rpm to make the most out of fuel consumption.
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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