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You're missing a big part of the HX advantage - gear ratios. If you swap in an HX trans, you'll get a big highway boost. Even better is the 92-95 CX/VX transmission.
Aerodynamics will help a lot at those speeds.
Neutral coasting when you can will also help. Running the engine at 3000 rpm is a waste no matter what throttle setting you have. Idling at <1000 rpm is much better.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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