Also have a look at as.com for the Mileage Plan rental car partners and what you can earn:
https://www.alaskaair.com/content/mi...ental-partners
For Hertz:
Earn 50 miles per rental day on rentals of one to four days, or 500 miles per rental on rentals of five or more days, on qualifying rentals at participating locations.
Use Mileage Plan™ discount number CDP 321739 for savings and benefits.
Earn 4x miles and save up to 35% on base rates.
Earn up to 2,000 miles per rental at participating locations in the U.S., Puerto Rico, and Canada through December 31, 2018.