Well since I now need a battery I have been looking at lightweight VS standard, my calculations show that if waight savings were 30 lbs then on a 3,100 pound car running 14.6 in the 1/4 then you mathematically get 1.4 tenths or just over 2 HP. Well you have to ask your self if that increase is enoughf to warent the possible headaches ? I live in the Pacific North west, and most of the time in the winter it averages out to 3 c / 37.4 f so the 64 million dollar question is, Is this to cold for a lightweight that sits most of the winter and gets only weekly start ups Also note that the 06 service manuals state that @35 mili amp parasitic draw that 20 days may be enoughf to inhibit start in a battery that is not in top shape.
Cheers
Mongoose57