Anyway, nobody has answered my other question about cruise control related to gas mileage. Do you get better gas mileage with it or without it?

And is it important or not to keep your rpm's down as much as possible?

Since our Odyssey has automatic transmission, if it is on cruise control, it keeps shifting up and down a lot. If it is NOT on cruise control, I try to prevent that from happening, so I can keep the rpm's low. But Rick says that would be bad, because I might be causing the engine to lug, which would be bad for mileage.

Any opinions (or facts) about those things?