Originally Posted by PeteHski

Okay, looking at my A-Events vs accumulated totals over the last year:-

Z1 : 47% vs 40% (Active Recovery)
Z2 : 19% vs 25% (Endurance)
Z3: 15% vs 17% (Tempo)
Z4: 10% vs 11% (Threshold)
Z5: 9% vs 7% (VO2 Max and above)

So reasonably close overall. Note that the above totals do include my event rides, but there are only half a dozen of those vs hundreds of training rides and indoor sessions.