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in the end, I feel like I should be getting at least 48, since during the 28 mile commute, almost the entire time the MPG bars look like they hover around 55-60.
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Instantaneous MPG can be very deceptive, as very small swings in actual gas consumption appear as huge swings in MPG. Also, the amount of gas consumed during accelerations is very difficult to estimate from an instaneous bar.
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I'm nearing the end of my second tank. I keep it in cruise control set at 55-60 in a 65 zone and travel 28 miles each way uninterrupted by traffic. The terrain is mostly flat (Orange Count) with some small inclines that usually top off with longer declines and there are bridges to cross about every 3 miles (on average).
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You should be averaging much higher with a 28mi each way drive at those speeds. I get similar numbers to you (also in Orange County, so similar climate) but my trips are much shorter, with a lot of hill climbs. I regularly cycle my pack to about 1/3rd left multiple times a day. The hill I live on alone (I go up and over, with several stops) reduces my tank mileage about 10%. My custom wheel/tire combo is also costing me as much as 8%. I also drive ~70 on the freeway most of time, and to top it all off, the HCH-1 was slightly less efficient than the HCH-2 to begin with. Given that scenario and driving style, I'd expect more like the ~50 you were seeing initially.