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Originally Posted by maczo
I do have a spray-can ad-hoc sealant but I'm not sure this would suffice. Any thoughts/experience on that?
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Nope, nothing.
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Will that have a measurable influence on FE? I think most notably it will decrease the idle consumption, so with P&G maybe also a bit improve real-driving FE just that tiny bit. But is that on the order of 1% even? 
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Every bit counts, you can do something and gain 1% or do nothing and burn more fuel. Of course sometimes getting another 1% will cost you $$$ and it's not economicaly justified, but since DRL's aren't heavy for your budget and you'll get few bucks back from bulbs that you won't need to replase to often, I think that's worth trying.
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I was thinking high vacuum reading would mean high engine load and (assuming low RPMs) optimum BSFC. Is this true?
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"Sweet spot" is one thing, and high vacuum is the other. You can't drive always witgin BSFC rev range and then you should maintain high vacuum. It meens that the throttle is closed as much as possible to maintain your speed.
When I was driving Prevka (
http://ecomodder.com/forum/showthrea...via-19600.html) I've noticed that after I've got to the speed I needed, I could actually let the pedal go a bit with noticeable difference in FE, without slowing down. So I could drive the same speed with two FE readings.
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As for belt off, I think it will be risky for Saturdays. Usually there is quite a lot of driving and the schedule is tight. This means no room for battery going dead. But fur Sundays' super-stages that might be a viable option (if it's not violating the rules, which I think it should not). I just need to see how much work it takes to remove and re-mount the belt.
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Just make sure that the belt is not pulling water pump together with alternator.