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For this approach to make sense financially, you would neither either (or both) of:
1) fuel that is much more expensive than it is now;
2) a supply of free or cheap batteries.
Fortunately, I've found (2).
Today, with two 6v "junk" batteries (from the forklift company) in series to make 12v, then in parallel with the existing 12v starting battery, I did a 46 mile / 74 km alternator-less round trip.
Starting voltage: 12.68
Ending voltage: 12.40 (batteries resting for 1 hour)
11.7v is "empty", so I used 26% pack capacity in that trip, with light accessory load: wipers occasionally; heater fan occasionally; lights; occasionally; plus engine overhead, turn signals & brake lights.
Assuming similar electrical loads, my total range to 100% depth of discharge is about 177 miles / 285 km.
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