Have now had my 750 back for a bit and my report:
1. performance is visibly improved. The motor rocks (or is back to really rocking -- I hadn't noticed how much it had sagged a bit by 60k). It's an amazing performance vehicle given the size and weight.
2. My gas mileage is actually better by about 3 mpg. It's still awful at 16 but better than Aston Martin territory.
3. I am charging the car every night using a BMW charger, using the under the hood connections. Every night, the battery needs the charge (amber light) for several hours, minimum and usually overnight. It's not the PITA I thought it would be but clearly the motor on this thing eats batteries, as noted elsewhere.
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