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I have a 1986 300 SDL myself. It currently has Goodlear Assurance fuel Max 205/65R15 LRR tires on it. It got just a tiny bit over 30 mpg with freeway driving between 65-70 mph, and more than 40 mpg at a steady 50 mph. It gets less than 20 mpg in the city though.
I'm planning on turning it into a 45 mpg highway, 150+ mph top speed machine. This will entail a much taller rear end and/or wheel/tire size and lots of aerodynamic work. City mileage won't change much, but lots can be cheaply done to improve highway mileage.
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