Just so we know what we are talking about.

This is the elevation profile for Hwy1 / Hwy5 from Calgary to Vancouver. 1000kms. Look not just at the total difference but also the profiles on each side.
That's the price of avoiding one partial day of potential headwinds.
Having done this route a few times the wind generally picks up around Kananaskis and drops off past Canmore. About 40km's.