From NY to WDW on I-95 I'd say I average about 75-80 mph, this includes stops and the areas where the limit is 55 and radar detectors are illegal. If you plan on speeding I highly recommend a radar detector, based on my past 2 trips down, I've only noticed CT and NY using laser (I have a laser detector too, but it's pretty much there to tell you that you're nailed) Most of the rest of the states were using K and Ka band radar, a few instant-on/Stalker types but for the most part I was getting about 1/2 mile range on them. A good rule of thumb is 10mph over and you should be fine.