A full week of commutes on the new route to work and a few bits of info gathered...
The first 6 miles of my commute to work is the same highway whether I use the new route or the old route. Where the route splits there is about 5 miles left to drive on the old route and about 6 miles to drive on the new route.
I have found that the new route gives me a better opportunity to get higher mpgs but the increased traffic on that route often negates the opportunity to capture the available mpgs (traffic lights are always red when I hit them because of their short green light stage and rarely can I coast through them vs. stopping at them or increased traffic forces me to interrupt coasts).
At the point the two routes split I was able to gain about 1.5 mpg from that point on the new route. On the old route I was able to gain about 2.5 mpg from that point (when I say "gain mpg" I mean on my SGII from the reading at the time of the split).
There has been alot, and I mean alot, of rain this week so my new route experiment probably needs another full week to verify if it's worth it. If I had to choose right now I'd stay with the old route as their is less traffic and more flexibility in my driving.
After 175 miles on this tank I'm at 61.5 mpg on my MFD (down 1.6 mpg from my best tank ever at the same mileage). I've had to drive on the highway alot more than usual on this tank (approx. 75 of the 175 miles...usually 25 of the 175 miles) so my mpg is feeling the effect of that. I have about 300 miles to get back to 63-64 mpg on the MFD...hopefully it will be all non-highway driving.
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