Is there anything more/less desirable to the LLY equipped '06s than the LBZs? I am looking to update from my '02 LB7 to an '06 or '07. Should I search only for LBZ equipped trucks or is any '06 model approachable? Also, is there a fuel economy poll posted for the LBZ engines? I didn't see one like the one for the LB7s. Very interesting info!