For saving energy, bicycling and walking are far more efficient means of transportation than is travel by automobile. for example, when riding at 10.0 mi/h, a cyclist uses food energy at a rate of about 400 kcal/h above what he would use if merely sitting still. (in exercise physiology, power is often measured in kcal/h rather than in watts. here 1 kcal 5 1 nutritionist’s calorie 5 4 186 j.) walking at 3.00 mi/h requires about 220 kcal/h. it is interesting to compare these values with the energy consumption required for travel by car. gasoline yields about 1.30 3 108 j/gal. find the fuel economy in equivalent miles per gallon for a person (a) walking and (b) bicycling.