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The main reason for the gain is
1. Higher air pressure
The distant 2nd is the actual size and aero.
My EV has donut spares on all 4 wheels, they are rated for 6x the total weight of my car.
However those donuts are exactly the right size for my car and the car was designed for bias tires.
So for the rear of your car just keeping lots of air in the tires will do almost exactly what donut spares do, if you downsize remember that your car has to be light enough on the backside for the tire or you won't really gain anything and might loose. I would actually weigh the back half and see what they are at if you want to test skinny small tires on the back and make sure you aren't getting too far into the weight rating on little tires.
Another concern is the fact that most small tires do not come LRR. But if you air them up it won't matter much. Just watch your weight ratings.
Cheers
Ryan
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