Thanks for the update!
He said / she said. Shell stands by their methodology, yet the advertising standards body critiqued it on multiple points, and ultimately ruled that the advertising was misleading:
Quote:
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"We noted that tests were carried out nine times on each car, and that the results showed that only two cars achieved average fuel savings of at least 2%."
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It's not clear from the description if the testing was dynamometer based, or "in the wild". It sure seems to me like they did on-road testing. Can of worms!