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Hi buckyball - welcome to the site.
I second SVOboy's advice to get a ScanGauge. Aside from its utility as a code reader, unless your truck already has a stock fuel economy gauge, that's where it will be most useful.
I know you implied "vehicle" in asking for advice on mods in your introductory post, but driving mods are the most cost effective. Fuel economy instrumentation is the key.
The other vehicle mods people have been suggesting sound reasonable so far.
One thing I have to ask, not knowing the vehicle: while I can see your need for dual mirrors due to the vehicle's size & height, does the mirror area have to be so large? What about retrofitting smaller, aerodynamic automotive style mirrors?
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