Review on Formula Energy 205/60 R16 92V summer by Wiktor Janic ᠌

The season is over now. There isn't much wear (I drive a lot), and normally everything would be great, but my gas mileage has increased by 1.5-2.0 liters since the winter. 7-7.5 l/100 during the winter with warming up. Without even warming it up (I drive it the same way every time), I can't get it below 9.5 liters per hundred. Never in a million years did I think winter would be cheaper than summer. I would have rated it 5 stars if it weren't so expensive.