Today there is a snowstorm in Finland, during which I noticed that slow speed driving might require pressing the accelerator somewhat more. This made me think whether driving on thick snow reduces fuel economy so much at higher speeds that the effect is noticeable.
So, does thick snow reduce fuel economy, and by how much? For example, if you have driven a long trip on clear roads and another long trip on thick snow, by how much did the fuel economy decrease?
Of course, when averaged over the entire year the effect is likely negligible, as the roads are plowed quite soon. It is probably the case that the effect of cold weather averaged over the entire year is bigger than the effect of thick snow.