[averyrm]

Figure out how much it burns per hour, multiply that by the cost of fuel, then add that to the rental price - there you go instant "wet" rate.

Some places reemburse totally for off-site fuel expenses, some only reemburse for a set ammount, this being of course when you're on the wet rate.

At the FBO I worked at, the dry rate would save you some money if you were going on an XC and leaned the aircraft properly. For local area stuff, you'd end up paying more.