sounds like your on the right track , i would definitively invest in a fuel economy gauge whether it be a scan-gauge or an ultra-gauge, Mpguino pre-1996. Keep a fuel log it sounds like carrying loads your economy will move up and down depending on how much time you spend with the load but that's what the notes are used for right.
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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