I'd definitely go with the LRRs. According to a tirerack article, 2/3rds of the rolling resistance of a tire is from the tread and plies (
http://ecomodder.com/forum/showthrea...res-14133.html) where 1/3rd is from the sidewall and bead area. Going with a LRR vs conventional tire IMO is quite important and worth the small aero penalty for a slightly wider tire.