Originally Posted by Rich91710
Except stop signs and traffic signals offset that savings and end up hurting more than the reduced speed helps.
Best to just stay in the right lane on the highway and keep it a bit below the limit. 55-65 (indicated) seems to be the sweet spot.
You are right of course that lights/stops hurt. However, I was able to take the family down to Myrtle Beach last April taking interstates the whole way down. On the ride back, I took the state highways (with lights in the urban areas) but where the speed limit was 10 MPHs on average lower. The trip back yielded better mpgs even with the urban area lights. For the most part, you can get a decent pace set up and only hit a third or so of the lights (guestimate on my part). MPGs went up by 4 in the MDX (about 15%). But to your point, you need to know the ins/outs of the alternate route. A steady foot and lower highway speeds might be the better choice.
PS - For a good part of the ride back (to for that matter) I drove off-peak; early morning driving while the traffic was minimal and lights tend to stay green longer on the main road.