Newly started the 800 cals per day 8 week BSD (Tuesday). I have a place in this years prudential RideLondon-Surrey 100 cycle ride on the 4th August. I need to do some serious trading to build from my current 25 mile to 100 mile. My question is should I increase calories on training days. I use a garmin cycle computer with heart rate strap and this calculates burned calories. These are never going to be 100% accurate. Should I perhaps add half the burned calories? Or should I stick to the 800?