11-26-2016, 01:39 AM
Winter blend gasoline has slightly different distillation specs and there's more butane added in winter, but it shouldn't have made that much of a difference. "White Dog" may be onto something, because if you've changed to an ethanol blend then your mileage will go down. Personally, I've never gotten below 48 MPG and it's usually around 50-51.
