"............ this car will idle at 100mph and get 22mpg." Not with Carol Brady at the wheel I bet!? Maybe Alice?
With the FlowMaster dual exhaust, set up right, the mileage is quite achievable in this with the 318, provided you are keeping the speeds in the 60 mile an hour range. Much above 70, and that gas gauge will fly! Over all, seems like a pretty good price for a solid, if somewhat shabby, example. A good buff and polish would do it a world of good!