Chrysler's HEMI ... average pressure of all tires." Remember, though, that overinflating your tires is not great either since it can increase rolling resistance, adversely affecting fuel efficiency.

However, EPA estimates indicate the HEMI engines haven't done all too badly in terms of fuel efficiency. For instance, a 2024 RAM 1500 with rear-wheel drive and the 5.7-liter HEMI engine returns ...