The Federal regulations are based on a fleet wide average emissions. Large trucks and SUVs will always, ipso facto, have higher average emissions than sedans an

The Federal regulations are based on a fleet wide average emissions. Large trucks and SUVs will always, ipso facto, have higher average emissions than sedans and compact cars. If your product mix skews to SUVs and trucks — and they aren’t EV — then your fuel efficiency numbers will in aggregate be higher. Efficiency technology shifts the whole emissions curve down across the fleet. The curve invariably goes up and to the right when graphed against gross curb weight, regardless of emissions technology. The targets were set with the assumption of a shrinking truck and SUV market. When gas was pushing above $4/ga and everyone was saying it could hit $8 there was even a time when that started to happen. But at $3/ga the consumer preference is strongly skewed toward larger vehicles, higher off the ground.