I have noticed that the excellent linguistic package ExPex is no longer available on the website of the maintainer. (This package is not in CTAN and was only maintained there.) Does anyone know why? Is it no longer being developed? 


Question: Is Start & Stop technology good or bad for my car? (Alfa MiTO)
Answer: I would imagine that this sort of technology would lead to increased wear on your starter motor, as it is being used far more than it would normally be, however I would hope that they would have anticipated this and designed the starter to be more robust than a traditional one.

The battery should be able to cope with it fine all the time it is in good condition. Batteries do, however, deteriorate over time, with a usual life of around 8-10 years at most. I suspect that as your battery starts to deteriorate, it won't be able to cope as well with the increased drain, leading to the car failing to re-start with traditional flat-battery symptoms. How well the electronics cope with this remains to be seen!

As to your third question, I doubt it will help much at all. Getting an engine started needs quite a lot of energy (hence the big chunky battery), and the only way to get that energy is to burn fuel, through your alternator sapping power as it recharges the battery. I don't know the exact figures, but I suspect you'd have to have the engine off for a fair while to save enough fuel to offset the cost of starting it again.