N=3? That's too small a sample to know what the car's capable of. You need to start your fuel log. 65 mph on the highway is much too fast for best FE. 55-60 is nearly every car's sweet spot.
Fiats haven't been bad in a long time. I rented a Fiat Uno and drove it 1000 km around Israel in 1996. It ran flawlessly. I sat in the Cinquecento. It;s big enough to seat two of me (5' 7") in front and back seats, but put a longer-legged person in the front seat, and the rear seat passenger better be <5' tall.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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