Obviously on a flat road cycling is a more efficient form of transport than walking but when faced with a steep incline I would prefer to walk (despite being a competant cyclist), but surely the mechanisms which make cycling preferable on a shallow incline are still relevent. Am I misguided in my assuption that walking is more efficient on the steep? If not then at what incline does the swich over happen?

With winter approaching and temperatures in the region of -10oC to -20oC expected, I want to know what the most effiecient way of heating my home is.

As I see it there are broadly two options, I can set my heating to, say, 17oC (while I`m out) and increasing to 21oC, 30 minutes before I return home. Or, I can let the house cool own more, to say 5oC through the day, using less energy, but then to return to 21oC I`ll burn more fuel.

So I repeat my question, what is the most efficient way of heating my house? I feel that this is of increased importance due to the impact of ineffiecient energy use and global warming.