How I got an extra 25 miles for basically free

[dogsridewith]

Originally Posted by IllusionX

Density will change inside the tire as air temp changes. That's why you tire pressure is greater when it's hot outside, and would "deflate" itself when ambient temp drops.
Not when you fill up

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Not exactly. For a temperature rise, pressure increases and density is unchanged because mass and volume stay the same with the closed system.