If I fill my tires with helium instead of air, could I haul more weight legally?

But sometimes you really just have to go!

 

You would have to calculate the volume of each tire, and get the weight of each cubic inch of air at 100psi, THEN multiply by 18. Of course, it all depends on whether you're using summer air or winter air.

 

Had to be a mistake...
I'm not that brilliant... LOL

Stopped clock right twice a day.
For those that remember a time before digital clocks and dang I just dated myself with that comment.

 

Soooo true

 

Not just the difference between summer air and winter air, but you have to take atmospheric pressure into account as well, so you have to know your altitude, and the altitude of both the highest and lowest points you will be traveling through, as well as the altitude of your destination.

 

There's a whole lot more to this here truckin' than it looks like from the outside.

 

Oh come now... let's not confuse the issue by adding the complexities of heavy damp moist summer air vs light dry winter air... now you're just going to the extreme to make it too complex for this trucker.

But you have a point...

{runs off to google how to convert 100 pounds per square inches to a cubic inch}

 

You also have to factor your speed, as the centrifugal force would also move the air to the outside of the tire, altering the balance of the tire. Also, how much tread is still on the tires? Racing slicks weigh less.

 

No, that's not what I meant. Summer air, being more humid, will have a different volume than winter air, because the water vapor will convert to liquid under pressure, and liquids don't compress. See the dilemma???

 

Wait.... if I filled my tires with winter air at sea level, then drove it to Wyoming in the summertime would the tires over inflate due to the synergies of both heating up winter air and lower ambient air pressure... thus making the tires bigger and both increasing my speed and decreasing my fuel consumption???

We need to take this chat private,
we might be on to something here...