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On the return trip I did worse in terms of mpg but my mfd still stands at 68 mpg. My SGII reported 64 mpg on the ride home (I believe it is reporting about 2 mpg optimistic right now so 62 mpg is more realistic for the ride home). The ride home from Boston was difficult in terms of topography...felt like I was driving uphill most of the way so that probably accounts for the lower mpg.
I ditched TPS on my ride home as I didn't feel it helped me very much so I was running RPM, MPG, IGN and GPS. I feel like I need the RPM feature so I don't overrev the engine (plus I like to see when I get into 0 rpm) and the IGN figure so I can see when I'm at 5 IGN and maxxing out mpg. As long as you can keep your speed up 5 IGN (0 rpm) produces the best mpg followed by 16.5 and under GPS. I was using a combination of the two to get the good mpg numbers.
77 and 62 mpg for 90% highway over 70 miles is pretty good compared to the numbers I was getting before trying GPS (in the 56-59 mpg range). The GPS number on the SGII fluctuates very, very quickly and with time I think I'll do a better job with centering it on 16.5 and lower. I will note it was not useful under 50 mph as it ticks up and down too quickly. It seemed to be most useful from 50-60+ mph as it did not rise and fall quickly at those speeds.
Daox - When you talk to the Linear Logic guys tell them we NEED a 6 readout Scanguage III. I'd love to see TPS, IGN, GPS, RPM, MPG plus another readout!!! Now that I know how to program an Xguage I want to tinker with the one that tells you what percent of fuel to full the Prius is...might help me get a better sense of how much farther I can go on a tank (not to mention the other dozen or so XGuages that can be programmed).
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