I am a member of National's Emerald Aisle, but I haven't used them for a rental yet. Just wondering what the odds are of getting a bigger car. I have two reservations for a midsize car - one at National for $292.03 and one at Alamo for $267.28 (All extra fees included in those prices). I am willing to pay the extra $25 if I'm pretty sure I could get a full size car on the Emerald Aisle. But, if the odds are against it, I hate to waste 25 bucks! I need to cancel one, but need some input before I make a decision.