Just a rough calculation...I've had a 2002 CVT Insight for about 10 years. I've put a total of about 25000mi on it over that time since it's mainly used for in-town commuting, maybe averaging 2500mi/year. It gets about 47MPG (historically), so I might use 55 gallons/year. Just using the relatively high current value of $2.20/gallon (it would average even less), that's maybe $120/year. Pretty cheap to operate and I contribute a measly $18 in gas taxes. Very unacceptably evil! Now, if I would have bought a 2002 Civic instead (and had the advantage of 4 doors and a back seat), I might have been getting 32MPG, using about 80 gallons/year and, at $2.20/gallon, spent more like $176 and $26 in taxes (not evil at all!). My savings...about $56/year or $560 total. Lets say I am able to keep my commuter Insight for another 10 years, but now pay a $75/year surcharge...losing all the $56/year savings PLUS losing another $19/year penalty compared to owning a Civic. After those 10 years, I'll have lost $190 of the savings from the previous 10...now I'm at $370 that I've saved over 20 years...less than $20/year. And, of course, over the 20 years, I will have contributed $1110 in gas taxes and extra fees versus $520 for the Civic. I'm glad I at least contributed something to the environment..but WHY BOTHER!