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Looking at the graph it appears to me that the SkyActiv engine is happier at about 30-35% load at 2500rpm, not 70%. The island of efficiency is at around 35kW at about 2200-2500 rpms.
Like the other guys said, but it bears repeating: slow down. Aero drag goes up exponentially with the cube of the velocity, so slowing down pays dividends immediately and in a big way: doubling your speed multiplies the aero drag eight times. Backing down from 65 to 60 will reduce your aero drag by over 20%, while increasing your travel time by only 8%. Leave five minutes earlier, you'll never miss it.
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Lead or follow. Either is fine.
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