I have had my Optima "Red-top 34R" in my stang for 10 years now and have not had to get a jump since putting it in. My wife and I have even gone so far as to take my '66 to the drive in and not start it between movies, and it starts right up after the 2nd movie. And that is with an aftermarket CD desk, EQ, 2x platinum tweeters, 2x 4-way 6X9's, 350W sub, 2 farad cap, and an 8" sub-woofer. Our friends were right next to us and they turned off thier stereo since mmine sounded so much better than the stock one in thier '90 F150. LOLz
I have been thinking about mounting a couple in a jumper cart,and charing $5 a jump the next time we go to the drive in. I think I will make back the cost fairly quickly considering there are usually 10-15 cars with dead batterys after the 2nd movie is over. And the owners are scrambling to find a jump.