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The claim that a Vauxhall 20 made 100 mph at Brooklands on 26 October 1910 is presently unsourced. It does appear in this 1974 press ad for the firm's well-remembered Droopsnoot Firenza. https://www.flickr.com/photos/andreboeni/32598747724 The ad states that the engine was specially 'uprated' and fitted to a car with a streamlined racing-style body (and, as the photo shows, with plain disc wheel covers, which were believed to be more windcheating at the time). The car recorded 100.08 mph over half a mile. Although 100 mph speeds had often been reached by special large-engined high-performance cars, the ad claims that this was the first time a 3-litre 20-hp car had broken 'the magic ton'. When you consider that the contemporary Ford Model T was also a 3-litre 20-hp four-cylinder, and that the Model T had a manufacturer's quoted maximum of 45 mph and a best cruise of around 30 mph, getting 100 mph out of that kind of production engine in 1910 was pretty good work. Khamba Tendal ( talk) 18:07, 18 September 2020 (UTC) reply

You wouldn't have paid Rolls-Royce prices for a Model T but that's the kind of price you had to pay for that Vauxhall 20. Eddaido ( talk) 00:26, 19 September 2020 (UTC) reply