Nick's examples were done using a 328p on a custom board without voltage regulators, leds, peripherals, etc.
The mega boards have two voltage regulators, one of which I believe is linear and therefor very inefficient. According to this [link] the lowest power consumption it's capable of while using the on-board regulators is ~27 ma. That's with the adc turned off and processor in PWR_SAVE mode. Meh. Add on the logger shield and sd card and it uses even more power.
Was able to clean up a few issues and it looks like latching relay will work as planned with the possible exception of key in + key on after the CCM has gone to sleep. But I don't generally sit in the car with the door closed without the key in the ignition.
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