If I go DSR which setup is better power tank or Diginow or ?? advantages of one over the other
We need to write this up on the wiki, but here's the tradeoff:
Powertank: 25% more range, no charge rate improvement so charge time to full goes up 25%. Weight goes up.
Charger upgrade: depends on charger. Charge Tank and Elcon both yield ~3x charging improvement. Charge Tank consumes tank area so excludes a power tank, and weighs the most. One Elcon is less expensive, less heavy, fits in a case, and provides a little more than the Charge Tank. DigiNow Supercharger is very compact, ~8x charging improvement, lighter than an Elcon, but the most expensive. Fits in the tank or a top case but not a side case.
If you want more miles for a single charge, a power tank will solve that problem but try buying a windscreen first if all you care about is not losing highway range, because it's cheaper and highway range is mostly about drag.
If you want more miles **per day**, get a charger. A single Elcon will let you use 2-3 full charges in a day as long as you can afford 1-2 hours between stretches. The Supercharger raises that to about 7+ charges in a day, depending on your stamina and planning.