In my post about how many MPGs I get on my bike I said I worked the numbers for Pepsi and came up with two different numbers. I now know why. I had a two liter of Pepsi. That TWO liter had 800 Cal in it. I then did the math like I had a one liter of Pepsi. If I rerun the math using the 400 Cal/Liter number, everything works out the same.