My Morgan, an ''89 CVH, I have run on 95 ever since I brought it nine years ago. The previous owner had the carbs set for Leaded fuel, I have no idea why, so I had everything retuned when I first owned it. Earlier this year I tried 98 from Shell and found I was getting much better MPG. but as someone said a lot depends on driving styles, roads, and the state and age of the car.
