Bah, they're all equivalent; you just have to fiddle the units to make it work out.
I'm used to MPG, and don't see a compelling reason to switch. I also find it more motivating to try and improve my car's MPG by 5 MPG than to try to reduce its consumption by 0.2 l/100 km.
And for some reason, not folding the extra decimals into the units bothers me. If it were cl/km, I would be less annoyed. Yes, I know that doesn't make sense.
-soD
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