First hour out of Denver is almost all uphill going from Denver at about 5500' up to the tunnel at what must be around 10,000'. The last few miles to the tunnel are the real killers. Thin air & deceptively steep grade makes you think something is wrong with your engine.
The Vail pass is a piece of cake after Loveland pass but the grade going up past Copper Mtn is pretty steep too.
Don't try to be the fastest goat up the hill & don't be the fastest one down the hill either. They have runaway ramps on the side for a reason. Don't be needing one.
Just west of Denver there is a section of 70 called Floyed Hill. Nasty. Avoid it by taking the easier grade & much more scenic route through Golden & up Clear Creek Canyon. It will dump you back on 70 a little east of Idaho Springs. Lots of twists & turns but well worth it for the scenery.