indeed there are a few..
http://www.conectiv.com/cpd/your_home/energy_tips/kitchen.cfm

http://www.mme.state.va.us/de/hbchap7.html says-
"Assuming 8¢/kWh for electricity and 60¢/therm for gas, a gas oven costs 7¢ hr, while an electric costs 17¢ hr at 350º"

from another site:" gas is cheaper than electricity. One kilowatt hour of electricity contains 3,413 BTU's. A therm equivalent of electricity is 29.3 kwhr. The electricity per therm equivalent at $.11049 is $3.24. So, no matter what appliance, it is still cheaper to use natural gas over electric as an energy source."

Now I gotta find some recent bills.