I drive long distance weekly on my gas car. Full tank in summer (+20C) gives me 520 km, while in winter (-20C here) I get 430-440 km. I noticed it on my current

I drive long distance weekly on my gas car. Full tank in summer (+20C) gives me 520 km, while in winter (-20C here) I get 430-440 km. I noticed it on my current and previous cars. Maybe it's thicker oil and worse car efficiencies in winter ? And that's despite that full tank of gas has more gas in winter comparing to summer, gasoline is denser in cold temps.