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Heldring
5% is perhaps a bit of an overestimate probably but I was trying to figure out which variables had changed and the only two were dynamo and experience.
Dynamo savings:
Max 30 minutes per day not dawdling at breakfast/lunch trying to get ever on full juice.
45-60 minute saving for every other day when I decided to go through the night on the ‘going to sleep and waking up process’. However you can’t weight this factor as entirely down to the dynamo and this technique is easily possible with batteries.
Confidence, whilst it’ll be difficult to measure but it’s reassuring to know that I’ll never run out of battery. Also as @skinny said using a good dynamo light is brilliant, in my opinion, for night riding. Although, using a powerful front light is difficult to quantify it could potentially save you from hitting a pothole at night, buckling your front wheel and losing a whole pile of time.
Then I remembered another variable - for some reason my phone contract changed and suddenly worked in the EU. This could have been savings of up to 30 minutes per day.