It seems that time based supercharging is significantly more expensive than electrify America, and that's before the EA pass plus.
I just drove 2400 miles across i-80, and used electrify America a half dozen times where it made sense to do so.
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So. Crunching the numbers here, I charged at +100kw for 11 minutes, 50-99kw for 9 minutes.
Using EA Pass Plus, you pay a flat fee based on the highest charge rate (in this case 32c/minute, but with the pass plus 25% discount, so ultimately 24c/minute.)
For EA+ 20 minutes total, 24c/min + tax (7.25%) worked out to $5.15 for 36 kwh of energy ≈ 14.3c/kwh
This same charging session at the tesla super would cost
Tier 3 - 11 mins @ 69c/min = 7.59
Tier 2 - 09 mins @ 41c/min = 3.69
Subtotal $11.28 + 7.25% local tax, $0.81
Grand total $12.09, 36kwh = 33.5c/kwh
TLDR - Tesla supercharging costs 2.25 times as much as EA for the same electricity. (Lincoln, NE)
Saved $7 at EA.