Sharing my recent experience. When I returned my vehicle, I glanced at the bill and noticed that it was higher than my original quote. Checked with the staff inspecting the return and he told me it is probably due to the petrol or the insurance which I then informed him my original quotation did include upfront petrol and full LDW. Fortunately, I had my print-out with me and I showed it to him. I was then brought to the rental post and I explained my situation. At first I thought it was because I picked from the Executive / Emerald Aisle and was billed for the "upgrade" but it turned out that I was stuck will all the other extras which I had declined. The staff could not "remove" the extras but she eventually added a line entry for credit note to LDW (which I did buy) to offset the other extras which I did not buy. I got back the original pricing but it took over 30 minutes of standing in the cold. Fortunately, I gave myself over 2 hours for the car return and shuttle ride. Things could have easily went the other way.