Tires

I have not seen this commercial but I suspect the statement is more like " underinflation CAN cause a loss in traction". Testing on dry pavement our test track, we find that, depending on the amount of underinflation and the speed of the vehicle, braking traction can be better or worse than the same tire set at the recommended pressure. Technically, this is caused by a reduction in cornering stiffness and lateral stiffness and also changes footprint length and pressure distribution across the footprint.

Fuel Max
Pros - Improved fuel economy, same wheels/rims, no change in vehicle track width, replacement tires widely available, steer, drive and traier tires all the same size (easier tire/retread management) no change in vehicle trade-in value.
Cons - No reduction in tire/wheel weight

Wide Base Tires
Pros - Improved fuel economy, reduced tire/wheel weight
Cons - New wheels required, wider axle to retain current track width, limited tire replacement availability, steer tires different size than drives and trailer tires (what to do with worn steer tires?), trade-in value of vehicle may be compromised due to "non-standard" tire/wheel/axle sizes.