According to Michelin's site, the MXV4 S8's have an "Energy Saver Construction"...so I assume that means they are low rolling resistance tires. The replacement Exaltos don't advertise that, so I assume they are not LRR tires.

I just swapped out my factory Dunlap LRR tires on my HCHII for winter tires (Dunlap M3s), and noticed an immediate 2-3 MPG drop so far, and I have to be much more attentive about keeping my state of charge up in my car because it just doesn't roll freely to a stop like it used to.

I'm bumping up the pressure tomorrow a couple more pounds from 40 in the old tires to 42 in these to see if I can get back some of the mileage as my new tires support another 5lbs more max pressure, you may want to do the same if the tire safely supports it.