Burning shelled corn as a fuel can be a feasible way of dealing with the high prices of more conventional fuels such as fuel oil, propane, natural gas, coal, and firewood. However corn over the past few years has has gone up in price. The
economics of burning corn is not the same as it was a few years back.

Shelled corn is a fuel that can be produced within 120 days, compared to the millennia needed to produce fossil fuels.

The energy content of shelled corn is not a constant value because of biological variability and management factors. Generally the energy content of corn is in the range of 8,000 to 8,500 BTU per pound of dry matter. A BTU (British Thermal Unit) is a unit measure of energy. One BTU is the amount of heat energy needed to heat one pound of water one degree Fahrenheit. The factors that may influence the energy content of corn include variety of corn, weather conditions during growing season, weather conditions at harvest, drying method, and storage conditions.

In all the charts on this web site, the energy content for shelled corn is assumed to be of 8,187 BTU per pound of shelled corn for all the analysis,
On this site are several  charts, and spread sheets that you can open in your spread sheet program and plug in your numbers to compare  corn with other fuels.
the key factor in all these charts is this   1 bushel of shelled corn = 5 gal of LP gas
                                                                                                      3.3 gal fuel oil
                                                                                                      134.3 KWH of electricity
                                                                                              4.58 therms of natural gas

check out the
savings calculater
Threshing Floor Energy, Inc.
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