seems valid to point at CAFE, but I disagree with the exact framing
post is saying 'trucks are larger because it decreases their fuel target', I'd prefer a take like 'setting abrupt boundaries in policies leads to strange effects at the boundary'
unnecessary categorization disrupts optimization processes
Not sure why you'd want to regulate vehicles rather than taxing fuel directly, but even taking fuel tax off the table, a continuous scale would let manufacturers find a better balance than imposing a hard limit