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Broski499, my mom has a 2008 Prius, and she averaged mid-upper 40s in the winter normal driving + new tires, and high 40s-low 50s now that its a bit warmer.
She has been running new Michelin X-ice snow tires this winter, but inflated to sidewall max (44 or 51 PSI, I forget which). She also runs a nearly invisible upper grille block that helps with warmup slightly.
Keeping your speed below 65 MPH will help, but she doesn't do that (she's not a hypermiler lol).
A dying hybrid battery will lower your mileage.
Winter does take a larger toll FE-wise on more fuel efficient vehicles, especially hybrids.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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