@TnUplander So to make things worse, not only do we use different gallons (US = 4 quarts, Imperial = 5), but we measure octane differently, too.
https://www.etuners.gr/fuel/
Short story, 87 octane in the US maps to the standard grade fuel in Europe, 91 is mid grade US, 93 is high grade US. I'm note sure what the typical octane numbers are for standard/mid/high in Europe, so I won't speak out of turn.
US does combined as well, but it's less popular than the city/hwy numbers. But if you look at a modern window sticker, they're pushing the combined cycle now, and generally feature it above/larger font than the city/hwy figures. Usually falls about in the middle. My out-of-thin-air guess is that 18 Combined is probably 15 city, 20 highway. Give or take. We'll know for sure late this year when the US figures are announced.
https://www.etuners.gr/fuel/
Short story, 87 octane in the US maps to the standard grade fuel in Europe, 91 is mid grade US, 93 is high grade US. I'm note sure what the typical octane numbers are for standard/mid/high in Europe, so I won't speak out of turn.
US does combined as well, but it's less popular than the city/hwy numbers. But if you look at a modern window sticker, they're pushing the combined cycle now, and generally feature it above/larger font than the city/hwy figures. Usually falls about in the middle. My out-of-thin-air guess is that 18 Combined is probably 15 city, 20 highway. Give or take. We'll know for sure late this year when the US figures are announced.