Why not just use the EPA (for US, Euro, Japan, etc) designation? For the 2012 Civic it would be: CNG, Hybrid, HF, 1.8 Auto, 1.8 Man, 2.4 Man, or so. Might work especially since those designations are based on MPG and people are using fuelly.com for MPG. Helps with filtering too.
ghammerly 
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