I did a little A-B test tonight comparing 'driving with load' versus cruise control and here are my results:
Temperature: 11*C
Winds: coming from the south @ 15km/h.
Route:
Attachment 374
Here's the
YouTube Video of the test.
Driving with Load:
FE average:
60.5 mpg
Speed Average: 48 mph
Using Cruise Control:
FE average:
60.2 mpg (a 0.5% mileage decrease if you're picky)
Speed Average: 48mph
Looks like using cruise control is virtually just as good as keeping a steady throttle and letting the car speed up and slow down as it likes.
I tried to make a video of the test & everything went well except the
last clip where I announce the mpg with the cruise: It didn't record on camera

!!! Now I know how people feel when they get all geared up for a UFO sighting and miss the final alien shot

!
I'll probably still post it later because there's some funny parts where a guy driving an SUV gets all angry after I point the camcorder at him, and me full-throttle accelerating like mad so I can simply merge onto the highway.