When bidding for a rental car on Priceline, do they calculate the %-based taxes and fees on the amount you have bid or on what their "retail" total would be? Do they "tell" you what your final cost will be (if your bid is accepted) BEFORE you submit the bid? DETAILS: I have an ugly ugly ugly rental period (MON 3/11 2:30pm- FRI 3/15 8pm) and can't use coupons. Fortunately I am a KLM ff member so got National Emerald Aisle for $219. I want to try PL but am afraid their fees/taxes might put my final cost above that at National.