I've been riding both a stationary bike - especially in the winter months - and my various "road" bikes - which include a Trek 1,5 Alpha, a Surly Long Haul Trucker, a Surly Pugsley and a 1990 Gary Fisher Tassajara MTB. All my road rides include hills - there's no getting away from them where I live! I know I'm "burning up the calories" going up each hill, but once over the top and going down it's a "free ride" with almost no effort at all . I'm not into speed, so rather than powering downhill I'm more likely to be on the brakes. With the stationary bike, I can keep the resistance steady the entire workout - no "coasting". The question is, for a given time period, am I burning more calories on the stationary bike or riding my road bike up hill and coasting down. Comments?