Thanks for the comments....I am still open for more. My appointment isn't until next Thursday. I don't want to get screwed, but I also respect the importance of preventative maintenance. I also know and respect the cost of major component repair and don't want to get caught holding the bag if something serious were to fail just beyond the normal warranty period.
Can you give me one example of 'preventive maintenance' the Volt needs that isn't prescribed by the Mfr. maintenance schedule?
Going back to the dealer for no reason is just asking for them to find something that isn't wrong, make something up, or cause a problem down the road, and pay them money to do it!
Tire rotation/balance ? , That too is a bit of a scam that is done too often on ordinary passenger cars. If your tires are wearing evenly and rolling smoothly, vibration free, why mess with them? They DONT need balancing! It just creates an opportunity for the "mechanic" (the guy doing tires is NOT a certified mechanic, BTW) to scratch your alloy wheels, damage your brake calipers, over-torque your lugs nut, warp you wheels, mess up your tire pressure; and create vibrations at 70 MPH you didn't have before.
The only real preventive maintenance a modern car needs is checking the tire pressure, and these day that can often be done right on the instrument display (yes, including the VOLT). BTW, it just got cold outside, so we all need to add some air to our tires.