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Instrumentation like a Scangauge or Ultragauge could help (I personally would recommend the Ultragauge unless there is an Xgauge for lean burn on the Scangauge). My '97 DX would more or less maintain the same speed with different throttle amounts, but the mileage was much better with a light foot. Being able to see what works in real time helps a ton. It would likely help you with diagnosing the issue (if there is one) as well.
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