[RM7]

Well, in a few isolated situations, it is. Going by the numbers, the GT500 is about 225 miles per "reacharge", using it's average mpg. Using the highway average for the entire tank, it only increases to 288. This is partially due to a tiny fuel tank that they put on the mustang, no doubt to keep the weight down, but not really big enough to give the platform the flexibility it needs IMO. These situations are usually far and few between though and unless you are frequenting real remote areas, such as in Nevada, Utah, etc., it's really not an issue 99% of the time.