Here was my test setup:
- Car fully charged parked inside garage
Garage ambient temp 72F (measured by the opener--yeah don't know why they put a temp gauge on the opener!)
At 5:55am (yeah I'm an early riser) programmed the go time for 6:15am with HVAC off
Sometime before 6:10am the EVSE relays clicked on (6:10am is when I walked out to check)
At about 6:12am or so (~3 minutes to go) the fan turned on and the Juicebox read 7A, 1.7kW
Right at the go time of 6:15am the car shut down (but the EVSE relays stayed on)
Total power consumption on the display was 0.0 kWh
So I guess about 3 minutes of 1.7kW isn't enough to even register at or above 0.1 kWh.
Doing a little math: 1.7kW = 1680 (7A * 240V), 3 minutes is 0.05 hours thus the total power consumption would be 84 Wh--yeah not much at all (maybe 2/5 a mile @ 200 Wh/mile).
I have noticed that I get a very slight reduction in power consumption on my morning commute if I use the go time set with climate off (like a 1% reduction in consumption). I mentioned it to my coworker and he has been attempting to verify it without that much luck. The above numbers would indicate that there is a reduction in consumption by using the go-times but it is so negligible that it is probably buried in the noise.