Just tried to book at LAX vs. LAX Marriott vs. LAX Hilton HLE. Using my company's CDP in all cases. Small Sedan (B) Ford Focus or similar. I was always under the impression off-airport rentals were cheaper, too. Interesting that the Marriott location is not classified as an HLE while the Hilton one is. But apparently in this case instead of saving money you're actually paying more for the dubious privilege of having a worse car selection and a location with earlier closing times.

LAX Hertz:
1 Week at $187.68
Airport Concession Recovery: $21.53
Vehicle License Recovery: $6.12
Customer Facility Charge: $45.00
State Tourism Assessment: $6.57
Taxes: $20.46
Total: $287.36

LAX Marriott:
1 Week at $177.19
Hotel and Airport Concession Fee Recovery: $64.71 (so much for off-airport being cheaper)
Vehicle License Recovery: $6.12
Customer Facility Charge: $45.00
State Tourism Assessment: $6.20
Taxes: $23.56
Total: $322.78

LAX Hilton HLE:
1 Week at $171.93
Hotel and Airport Concession Fee Recovery: $41.79
Vehicle License Recovery: $6.12
Customer Facility Charge: $45.00
State Tourism Assessment: $6.02
Taxes: $20.88
Total: $291.74