I don't know how much lower crude prices will help people who use heating oil. The biggest price driver for gasoline/diesel/heating oil seems to be refining capacity rather than crude prices.
Don't know either, but I've been watching the HHO price at my usual source daily and it seems to be dropping in lock-step with crude prices.
I tanked up at the end of August when the price dropped a bit and felt smug when the price went up in September as expected. Now I'm almost tempted to turn up the thermostat in order to use up enough fuel to make room for the 150 gal minumum order!