there are trade offs.... the bigger the tire the rougher the ride, the worse the gas mileage, the shorter the range between gas stations, the more unstable the highway driving thru rain slush, snow..... looking right is hardly a reason to pick a tire…
A bigger tire will have
far better small bump compliance than a small tire, assuming the wheels are the same, or about the same size. Fair point about MPG, and it can vary depending on the vehicle. My JKU
hated my wide 35s, and I should have never put them on, they were the absolute wrong tire for the vehicle but after having cheap skinny tires I wanted to try giving the big thick tire a shot, not the right call for the vehicle.
And unstable? I'll comment below.
so on range, I went from 33/10.50R15s to 31/7.50R16s and gained 5mpg thats a 95 mile range increase with the stock 19 gallon tank..... an extra 100 miles between fills is huge and I'll never need a jerry can. I always had a bit of range anxiety before, not now..... and ride is 100% better, I no longer steer around cracks or potholes, they barely get noticed. [clipped image + text for size]
Your range went up because the engine on those jeeps isn't the best for pushing heavy tires, so I'm not surprised you saw an increase, but 5mph seems like a bit of a stretch to me, are you sure that is accurate?
Also, you changed tire height and width, so it's sort of hard to really make and apples to apples here. a 10.5 wide tire would be
narrow on an HD truck, a 7.5 wide tire? Forget it.
In terms of you steering around potholes vs not, I don't think it's fair to compare a very lightweight, short wheelbase, 2 door jeep with a HD crew cab. Additionally, I think you need to take into account the wheelbase difference between a jeep and a truck. Yeah, you may not need 37s to clear the pumpkin, or whatever, but the wheelbase on these HD trucks is pretty freaking long, and because of that you need to keep the truck up higher to account for that. You might be able to get away with 31s on a 2 door jeep, but you wouldn't want to on a power wagon.