If it's a loaner from the dealer then I'd put less gas in and tell them why. Next time our FFH has to go in for a few days I'm going to tell them that I want a C-Max or FFH to drive.
The only problem with that is my Dealer uses Enterprise as the Loaner fleet, they have a desk on the showroom floor - and whatever is in the lot is what you get (sometimes). I pushed it real hard this last time because all they had were older cars that smelled real bad or little econoboxes. Enterprise actually sent to the local Enterprise parking lot and got me a new Escape. The Dealer just told them to make the rental equal or better, Enterprise had to scramble.
I also saw the rental rate for my car, $24 @ day for the Escape Dealer price.
Regarding gas in the Rental car, that again is an Enterprise policy, not my Dealer's. Enterprise told me to take my gas issue to the Service Advisor, which I did.
I gave my Rental gas receipts to him and it had to go up a level to get approval.
I was offered Ford Owner Advantage credit on future service or a check to be mailed to me. I made it easy and just had them put in my FOA account, that way it stayed at the Dealer and I can use it for service charges (I have over $60 in that account now).
Edited by GrySql, 17 July 2013 - 01:03 PM.