I would think there are to many variables to go off any chart. They were probably tested in a very scientific manner and real world results are going to be way different. Your best bet is a vacuum gauge and some highway miles. Something else to consider about old charts and data is they were using 100% gas, not 10% ethanol like we have to run.
If you can keep your speed with the least amount of throttle opening and highest vacuum, you will get the best mileage possible for your combination.
