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One can improve city driving. I upped mine by almost 20% in combining trips and route planning the remainder. Cutting annual miles is the real game, not mpg numbers. We go 90% of the time to 90% of the same places. That's ripe for some work.
The gap between city and country, (solo, not towing) as an average became 21 and 24, respectively, in my truck which weighs four tons. Ten percent. Over an 1100 mile period.
A lot of work, frankly. I keep the reduced miles but no longer sweat the percentage drop. Twenty percent difference is fine. It is the fewer cold starts and miles that remains the real benefit, IMO.
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