Join Date: Sep 2013
Location: SFO/DTW
Programs: DL PM 0.5MM, Hyatt Globalist, HHonors Gold, SPG Plat, Marriott Gold, Avis PC, National EE, Hertz PC
Posts: 1,988
I am pretty sure the Enterprise upgrade coupons only work up to full size sedans.
Also, as a former frequent Enterprise renter, I rarely got upgraded.