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@user79885
Just my two cents worth on route selection for the TCR. Lets assume you ride two 25km long roads, one flat, one hilly, on the flat road we can ride at say 25km/h, so that takes one hour. Let's assume the hilly course rises for half its distance and falls for the other half. On the uphill you average 12.5km/h, and on the downhill 50km/h, so it takes one hour to reach the top, and fifteen minutes to descend. That's 1h:15m all up, 25% longer in time
Even if we ride up the hill at say 15km/h, that's 50mins, and lets assume a descent at 60km/h that's 12m :30s, so a total of 62m:30s. So 2m:30 (4.2%) extra. Is my maths right? Flat roads always look faster to me. Plus I didn't take into account that you travel a longer linear distance on the flat, km for km.