As far as I know, the 8.2 litre V8 engine found in the gargantuan Cadillac Eldorado coupé and cabriolet from 1970-76 is the largest found in any production car. Originally rated at four hundred brake horsepower, regulatory changes in both emissions and the measuring of a car’s power reduced this to as low as 190 bhp, before Cadillac made the Eldorado an overall smaller car. Performance is unimpressive when viewed today, taking approximately 12.8 seconds to reach 60mph, on its way to a top speed of 110-115 mph, with an average fuel consumption of nine to ten miles per gallon.
In the eyes of a British person, that level of gas guzzling makes it cheaper to take the bus, before I also realised that figure is in American gallons, equivalent to about 7.5-8.3 miles per imperial gallon. Even if you don’t care about the environment, those figures would make you weep.
The existence of these different units of measurement can be found in the UK’s Weights and Measures Act 1824, which introduced standardised Imperial units for use throughout the British Empire. Meanwhile, the United States customary system of units, themselves standardised in 1832, derive from the previous British system that remained in use after the US became an independent country.
Encountering American units is a novelty for me because while imperial measurements have remained alongside the metric system in the UK, efforts to make businesses voluntarily comply with the system ended in 1980 [https://www.leighspence.net/2022/06/sixteen-tons-and-what-do-you-get-347.html], while certain units like cubic inches, bushels, furlongs, hundredweights and stones were prevented from use in trade by the Weights and Measures Act 1985, despite a 2020 amendment making them permissible to use as supplementary to other units.
Therefore, a bottle of Diet Coke being described as twenty fluid ounces, or 1¼ pints, rather than just 591 millilitres was, for me, funny at the time, but also completely wrong. There used to be different measurements for different uses, like troy ounces and pounds for precious metals, and apothecary units for medicines, but the existence of separate wine gallons and ale gallons before Imperial standardisation explains why the American pint measure is too small: Britain continued with an amended ale gallon, adopting the standard 568 ml pint, while the Americans continued using the wine gallon.
Looking at Cadillac’s website today showed their non-electric cars’ engine capacity is now described in litres – the 8.2 litre Eldorado engine had instead described in advertising as 500 cubic inches, using the more common unit for car engine comparison at the time. Their page for the 2025 Escalade-V instead puts power output (682 bhp) and torque ahead of engine capacity, an added supercharger making the 6.2 litre engine size less of a factor in overall power. Elsewhere, the vehicles dimensions, from length and width to legroom and cargo space, is quoted in inches, or hundredths of inches (front legroom = 44.51”).
The most visible attempts at metrication in the UK was the decimalisation of Pound Sterling in 1971 [https://www.leighspence.net/2019/03/five-six-seven-eight-nine-ten-i-love.html], followed three years later by teaching metric weights and measurements in schools. Meanwhile, the metric system in the United States was legally recognised and protected in 1866, and the Metric Conversion Act 1975 made it the preferred system for weights and measures in US trade and commerce.
However, this voluntary nature, and the continued teaching of both American and metric measures in schools, means both Britain and America are content to use two concurrent systems, the metric system linking them both. That the United States dollar has equalled one hundred cents since it was introduced in 1792, before the metric system was adopted by either country in any other form, appears to be a total anomaly.
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