Another surprising fact is that you'll actually get much better fuel economy by not using cruise control.

The old carby technique of holding the throttle steady doesn't jibe with modern high geared vehicles
and I've found that these vehicles prefer that the driver keep backing out of the throttle and re-apply
the minimum needed to maintain speed.

If you hold a constant throttle (like cruise does) you notice that on the flat or slightly undulating roads,
the instant economy numbers will slowly get worse over a few Ks, it's like there's zone on light throttle
where the speed remains basically constant but the instant economy can change up to 20% or more.


Try it some time and you'll see what i mean...