Oyster card capping (zone 1 with one trip to zone 6)

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Accepted answer

The Oyster system is designed to give the cheapest possible fare in the vast majority of cases. From TfL's fare information page:

As you travel, the system combines all the zones, times and fares recorded on your Oyster card so it can calculate the cheapest cap to apply. This means that sometimes you could be charged a cheaper off-peak cap even if you've travelled during the peak. This is because the system calculates the cost of:

  • All the journeys you made during peak times
  • All the journeys you made during off peak times

It then adds these together to work out which cap would offer the best value.

This isn't exactly referring to your situation, but it is similar. The Oyster system is designed to find the best combination of caps to minimise the fare paid.

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