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The only way to know the contribution of the peddling would be to add a power sensing crank. Too expensive to bother with. That much of your power is essentially free as you are going to eat anyway.
You can use a Killawatt meter to keep track of the electrical usage from the wall and add this to the fuel consumption by converting everything to Watts and then back to gallons of gas. The Chevy Volt logging sites for example, allow you to enter the fuel and electric consumption side by side and combine them automatically.
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