I believe the best tank in my 2.0L Mazda3 was 52.8 mpg. I was driving for 220 miles at night with little traffic, so I was able to keep my speed in the 50s, which was still over-driving my headlights due to my poor night vision. I kept envisioning deer running in front of me, and the deer carcasses on the sides of the road kept my feelings of impending disaster fresh the whole trip.
Speeds in the 50s can produce spectacular mileage. At 80, I'm in the 30s too.
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