[cfg83]

Promising_Confinement -

Welcome to EM! I keep thinking of the UPS policy of route optimization for right turns :

ABC News: UPS Figures Out the 'Right Way' to Save Money, Time and Gas

However, I don't think that matters for you because you are driving off-peak.

Since you don't have a speedo, maybe a vacuum gauge would help you :

http://ecomodder.com/forum/showthrea...uide-3428.html

http://ecomodder.com/forum/7771-post59.html

Here is a vacuum gauge from the 1970's that did a similar thing to your speedometer suggestion :

MILEAGE MONITOR (vacuum gauge)
Auto Vacume gauge (vacuum gage) - Save gas and your engine

CarloSW2