I have seen a fair amount of power fluctuations during the season (usually by about 20watts)- I presume this is normal peaks and troughs?
9 April - Hillyish 10miler NP 303watts average 295watts (course pb 22:55)
7 May - Hillyish 10miler NP 287 ave 286 (24:38 tough conditions)
31 May - flatish 10miler NP 292 ave 291 (22:09)
7 June - flatish 10miler NP 291 ave 290 (22:16)
10 June - hillyish 50miler NP223 ave 220 (blow up badly 2:04:15)
17 June - Hillyish 10miler NP 301 ave 296 (23:13)
21 June - flatish 10miler NP 315 ave 315 (forgot to do ergomo offset before ride 22:03)
1 July - technical 24.5miler NP 262 ave 257 (forgot to do offset again 56:25)
21 July - technical 10miler np 283 ave 279 (23:15 - dead legs -1st race back after half IM)
22 July - technical 25miler np 263 ave 258 (58:23)
5 Aug - flatish 25miler np 276 ave 270 (58:22 - bit disapointed as tapered for this and felt good)
11 Aug Flatish 10 miler np 281 ave 280 (21:55 - finally beat best form last year)
Occasionally I am not sure if my Ergomo is playing up as one ride I can hold close to 300 watts the next I ride 280 but my placing against the same competitors is better. I guess that some times the conditions are not as quick as you think and that why some days you can ride at a good power but not go quicker as per my last 25miler.