Ron AKA, you're correct to compare the viscosities of different oils based on their HTHS viscosity and VI. Those two spec's are the most important and tell you everything you need to know about an oil's operational viscosity at oil temp's of 150C down to well below freezing; say -15C or so.
HTHS vis' is misunderstood by most but from a practical perspective it is an accurate measure of how thick or thin an oil is in an operating IC engine. Oil's with the same HTHS vis' and VI's within 20 points of each other will have the same operational viscosities at normal operating temp's as low as 70C and above. This was explained why in the following post:
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2001169&page=1
While an oil's viscosity is the most inportant factor in determining power and fuel economy, the coefficient of friction (CoF) of different chemistries is also a factor.
Red Line claims to use fluids (POE) and additives (Moly) that result in an oil with a very low CoF comparied to what is typically available.
But being first and foremost a race oil formulator fuel economy is not the target, it's high temp' protection.
Both their 5W-20 (HTHS 3.3cP, VI 145) and their 0W-20 (HTHS 3.0cP, VI 166) are not true 20wt oils and are not claimed to be if you read the RL literature closely. A mid-grade 30wt and a light 30wt respectively would be a more accurate discription.
Of the oils you've listed, you've made no mention of the latest crop of ultra low viscosity/high VI 0W-20 oils that are on the markets that have been formulated with the ultimate in fuel economy in mind, not just when up to normal operating temp' but on cold start-up as well.
The best example of these would be the Toyota brand 0W-20 with it's industry leading VI of 214. It also contains a boat load of moly. Being a 20wt oil it must start with a HTHS vis of 2.6cP BUT this oil shears by design almost 10% immediately in service. Id say it's HTHS vis is closer to 2.4cP in reality.
But what's most impressive about this oil is just how light it is on start-up, even at room temp. That is a result of it's ultra high VI. Based on it's inflated kinematic vis' spec's it's 20% lighter than M1 0W-20 at 20C and 30% lighter at freezing (0C). In reality it's probabily another 15% than that.