Welcome, but be careful. You say you're not into hypermiling but it's addictive
Best bang for your buck IMO is a mileage computer if you car doesn't already have one. Driving style changes are free and monitoring isn't that expensive. Once you have good monitoring, add a partial grill block. If you do a lot of highway, think about a belly pan. Improves aero and is invisible.
I like your car choice. It would be on my short list if I could afford a newer car.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km