I previously posted this under another topic, but felt it might get more exposure under it's own topic.
High gas prices are the pits.
If you have mifi and can look on-line while traveling, or are parked near a wifi area, these sites will help in keep the pump from sucking your wallet dry. They allow you to look on-line for the cheapest price on fuel in the area. It helps if yuo know the zip code.
http://gasbuddy.com/ with the zip code on this one - you will see all station's prices in the immediate area on a map.
http://gasprices.mapquest.com/?area=national You can select any type of fuel on this one...including propane.
These sites rely on the public to update their info, and by registering & doing so I understand you can win prizes in the way of free fuel. If nothing else, it's a fun way to feel like you are getting back at those price gougers