I've purchased a 12 MCA V6 a while ago also for fuel economy, but let me just say this. If you add up the whole year of your commute between the V6 & V8 I guarantee you you will only save $600-$800 of gas for the year. Also depends on your commute but people, including me think that we are going to save all this $$ and sacrifice the fun of the V8 for a couple bucks. Just not worth it. I recently told my friend the same thing when he purchased a 6 Challenger and when he did the math for his commute it was only $600. Go get the V8 and you will be happy you did.
Very good point and I agree with it. Obviously if you're doing 30k a year then get a 6.