Title text:
Highway engineers like Planck units because, like the speed of light, the energy capacity of a typical car's gas tank is 1.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3289/
Love also CGS system for electrical related stuff...
Battery rated for 0.3836g^1/2^c^1/2^s^−1^, capacity 3,236,000,000,000g^1/2^c^3/2^s^−1^