That would explain , I suppose, why on some days when I can expect less than good results it ends up being a very good run:
And other times when I expect a great mileage day it ends up much less.
I had assumed it was because of a combo of ouside temp, humidity and mabe even
atmospheric air pressure.
Some days it just doesn't seem to want to burn as good!

I'm definetly at an advantage with the timing of my commute at 2-3AM.
With no body behind me I'll let it slow down on the freeway hills to about 48MPH and hold it there @ max FCD as possible without slowing any further. If traffic is approaching I'll very gradually increase speed to 55 over about 60 seconds and let the passing +60MPH traffic blow by then if it is clear again, I begin to raise my FCD as much as possible.

Once I clear those big hills I'm in heaven.
I could stay on the freeway but the limit goes up to 70MPH and the hills continue.
I exit the freeway before that and finish the last 19 miles on a parallel highway.
The highway is a little twisty and I drive an extra 1.2 miles but it usually has zero traffic and I can keep the FCD on 80-120 much of the way.
Average speed is about 42. Occasionaly dips to 35 to keep the FCD up.

I guess there really isnt any great way to deal with the hills.
Steve

Efficient drivers do it better.
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT