KF credit for car rentals
I'd like to credit my Hertz rentals to KF for the 500 miles/rental instead of the 50 miles/day Hertz award to UA MP. The T&C state one must fly into the Hertz location on "SQ or a partner airline" within 48 hours of the rental.
Is this rigorously enforced? Would a UA flight into the rental city, flight credited to UA, qualify?