Here are my rough calculations (thanks Darin) on what I would need.
45 mile round trip
estimated 450 Wh per mile @ 60 mph (number based off
this and Darin's numbers)
45 miles * 450 Wh = 20250 Wh of battery capacity
20250 * 2 (so I don't go below 50% discharge to retain battery life) = 40500 Wh of battery capacity
12V Trojan T-1275 has 150Ah * 12V = 1800 Wh of capacity per battery
40500 / 1800 = 22.5 batteries worth of capacity
we'll just call it 24 batteries to make it easy to split up into series/parallel
24 batteries * 82 lbs each = 1968 lbs
So, as you can see, getting the Paseo to have a range of 45 miles @ 60 mph is no simple task. 24 batteries weighs almost as much as the stock car! I'm looking into if I can plug in at work or not. That would only require 12 batteries then.