I think you are doing pretty good. My VX (49 state) had a year round average of 48MPG (very very little city driving mostly flat land). In the summer I would hover around 51MPG. It was a lot of work averaging even the revised EPA standards. My car was in good shape low mileage and had a complete tune-up performed on it. For me I felt like they cut the VX mileage rating very close. It was doable but just barely and only in the best conditions and with me always paying attention. A lot of time the huge numbers you see are about location location location. Open country with no stoplights, or using hills to maximum advantage or cars modified for maximum drag reduction. For your conditions I think you are doing good....you can do more, if you want to go down that rabbit hole Alice.
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