Just back from a week at Pismo/Oceano Campground. Due to the terrible flooding disaster near Santa Barbara, Hwy 101 was closed so we had to use an alternative route, hwy 166 to th I 5 frwy, entering at the base of the Grapevine. It's the steepest and longest uphill I'm aware of. I've travelled the greater western states but don't consider the Beartooth of other tight 2 lane roads in the same category.
I use a DashBoss monitoring system to watch my 6.0 vitals and this was the most aggressive climb. Knowing how important the eoc/eot delta is, it runs about 7-9 degrees empty, 10-15 degrees when pulling, and here 23 degrees driving up the Grapevine. I keep my IPOD hooked up by Bluetooth on my floor or seat and do "screenshots" as necessary.
This was at the top of the grade, probably 10 miles. My boost psi will sometimes go to zero when it really is up around 25-26 psi. Highest delta reading I've every seen between oil and coolant at 23+ degrees, no worries. Intake air temp at 31 degrees difference, things heated up. High oil pressure at almost 2000 psi difference, coasting dropped it way down. Amazing my tranny never exceeded 180 degrees which makes me the most happy about these numbers.
Enjoy the comparison.