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[–] ShinyVoater 0 points 1 point (+1|-0) ago 

The US doesn't use imperial. The gallon is hard proof of that.

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[–] Mtat 0 points 1 point (+1|-0) ago 

It is called imperial in Autocad but it is not british imperial because british imperial is different from american imperial.

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[–] ShinyVoater ago 

Lengths are the same between the two systems. Volume is one thing they violently disagree on, as well as most any weight above the pound.

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[–] 7076415? 0 points 1 point (+1|-0) ago 

We use "customary" weights and measures, as there is no one source from which they all derive prior to being formalized.

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[–] ShinyVoater ago 

I think I've heard it called SAE as well, but the key point is that they're different.