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The major difference between EX and HX transmissions is in the final drive. Swapping the 5th gear would help but I think you're still going to lose fuel economy on the highway.
*However* pulse and glide can largely eliminate losses from too-short gearing, if you're willing to use it.
I'd personally use an HX transmission if I had your car. If you need more power you always have a lower gear, with the exception of first.
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