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I don't think the SG-II is really worth the expense if you already have the UG. The UG will do fine for day-to-day use. The SG-II is much better for diagnosing problems with hybrids, though.
There are some helpful videos on Youtube with Prius MPG tips. The ones featuring Gen3 Prii will have different instrumentation, but the concepts are the same.
What PSI are the tires at? Are they LRR? How long are most of your trips?
I have LRR tires pumped to the sidewall max of 51PSI. Most of my trips are less than 15-20 minutes, but with a little technique, I can pretty easily beat the EPA ratings while blasting the AC. I personally believe that brisk acceleration (usually at least what the rest of traffic is doing) is best in a Prius, provided you're not accelerating right before needing to stop.
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