yes car tires free spin is that jack up your tire and give your max speed to the tire with your hands. Max start speed you can give depends on the wheel weigth, your brake friction so brakes are on and your bearing friction and the power you have in your hands.
If you have a front wheel driven all all wheer drive car ofcourse the tire where you have drive axles dont spin but effect are same you just cannot measure them easily. That is why most people say they effect are not big with car bearings, but if you look at them so closely as those roller skate bearings same things happen also there and the forces are greater.
On wheels where there is no drive axles a working tire should roll 7+ seconds or in my opinion there is something wrong with it with brakes or bearings wise or both. you can get that time easily to 16 seconds with little bit of adjustments.
You can also use those same oils in your car bearings than roller skates if you modify them and add few extra seals etc...
http://en.wikipedia.org/wiki/Fuel_ec...ows_in_car.svg
About 5% bearings friction effect to fuel consumption on highway is something that you can change.
Today
Other popular topics in this forum...
