Don't turn the key without a plan. Always. Know the route beforehand. I make a loop around town for my errands to get [1] best warmup, and [2] best steady state driving to avoid stop-n-go. Combine ALL errands to a single day.
The best fuel economy is the vehicle sitting in the garage. Fewer miles = less fuel burned.
Consider that fuel is $6/gal, how will you use it? Slow speed is great, but never stopping is better (there's a combination in that awaiting your attention).
Or is it just too much of a hog to gain anything?
Mine is far larger and heavier than your little Jeep.
Good luck.
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