Given a mixed fleet with mixed drivers and mixed styles and conditions, the results are obviously... mixed.
Unless they drive the cars on the same route back-to-back with the same set of drivers (rotating), then the figures should be taken with huge grain of salt.
I semi-agree with the premise... as when I drove the Explorer EcoBoost, the economy I got was not really that much better than the V6... and the EcoBoost was only 2WD... but this needs controlled testing.
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