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I'd say gas pump error could be one factor.
They don't mention engine operating temps.
Since they tested two different days, there is no guarantee it was exactly 70mph both times.
No mention of air pressure in tires.
No mention of whether it was the same driver both times, heavier/lighter driver could affect numbers.
Its very cool that they tested this, and I am really surprised they went as far as to say how they tested it. Seems like a large increase though!
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