Welcome!
Sounds like you've a fun set of vehicles to play with. My approach is to make dead-honest-certain that all mechanical issues are "perfect" on a vehicle (worthy of study of details on how to accomplish that; things aren't always easy to dial in), and then using "trip planning" to combine all normal errands and/or commuting into the most fuel-efficient routing possible.
Fewer miles, better driven to accomplish the same work = high-percentage gains to an established mpg baseline.
Records are where one starts and ends. Fuel logs here, or smartphone apps, or pen & paper + solar calc.
I like to bring it down to a fuel cpm number (cents-per-mile) as it then dovetails with all other ownership/operational costs.
When I bring this up to other pickup owners I advocate that daily savings will more than pay for recreational travel (pulling trailers, etc).
Maybe there is an approach which combines work & play as a reward which you and the wife would both enjoy.
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