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Only just saw this thread today, going to just wade in...
Keeping some Vo2 work in your schedule keeps your top end switched on. You don't really need a super switched on top end unless you're in racing/going hard season but it's useful to keep you open, especially if you are doing ramp tests which largely calculate your final 1min power, which is when you'll be deep in that red Vo2 zone. So even if you're doing mainly SS or tempo training a Vo2 session (or just sort efforts tabata style) will help keep your range CV accessible.
My 2p on tabata - it's good, but research shows you have to do it consistently over time for it to make a difference, surprise surprise. I sometime throw 20sec on/10sec off x6 into a hill effort or on the rollers after a commute if I want to get a quick bit of deepness into my day.
That's interesting. During the TT season I'll be 'racing' most weeks (just club 10s) and for cross it'll be maybe 10 times over the season. you reckon add that speed towards the end of both?