[sickofparadox]

Because the fuel standards for those smaller vehicles are not realistic to hit. If you go to page 24 on this pdf [1] you'll see that for a car with ~41 square foot wheelbase they need to get 55 combined miles per gallon. This essentially disqualifies anything that is not a hybrid from even going into production at that size. I'll give you its true that Americans love big cars, but even my Ram TRX driving coworkers are complaining that trucks are too big and that they'd love for a early 00's or late 90's F-150 style truck again.

[1] https://www.govinfo.gov/content/pkg/FR-2022-05-02/pdf/2022-0...

[devilbunny]

I drive a 2000-era Chevrolet Tahoe. Large but not huge by SUV standards.

I park between an F150 and a Ram pickup. Despite the fact that all three are built on the same nominal size category - 3/4 ton pickup - the new ones make my 20-ish year old car look like a RAV4.

And it's not exactly a gas-sipping vehicle to drive.

I do wonder why nothing seems to get good highway mileage anymore despite all the improvements that have been made. My mid-90s Pontiac Bonneville got the sort of mileage around town that you might expect from a full-size sedan (even by American standards, it was large for a sedan) with a 3.8L engine driven by an early-20s male, but the top gear was set so high that it got 30 mpg on the road (7.8 L/100 km). Even modern sedans of the same nominal size get worse than that.

[Amezarak]

Thanks for the link, I've been looking for that. Without reviewing it in depth - I appreciate any pointers - it looks like going by the tables on page 26, the requirement for "light trucks" (therefore including SUVs) is also higher than what can be achieved without a hybrid system. I see similar tables near the end seemingly showing the same thing that I think your 55mpg number came from.