Originally Posted by
livedarklions
Body size (not weight per se) can be a factor in determining drag, however.
Weight is a factor in acceleration, but that probably has really small calorie implications unless you're hitting a stop sign every 2 blocks.
Indeed both of these are true. But, as you no doubt know, the effect is pretty small overall. The idea that calories burned should scale linearly with weight isn't close to being true (as you no doubt also know).