Woah!!! Sorry, don't want to mislead anyone here, ever. I hadn't crunched the actual numbers. That 550 roundtrip I thought I would be doing got altered somewhat. After viewing my actual numbers, it's more like 375 total miles roundtrip. With about 42 miles range left once back home. So could've been a more realistic 415-417 total miles on this single gas tank.
Which to me is still pretty good to me. I forgot to reset the trip meter before I hit the road this trip, so it shows avg 23mpg with a total of 895 miles now on my odometer.
And we took the nice, Austin area Toll Rd 130 from Lockhart to Elgin, aprox 35-40 miles. That Toll Rd has a posted 85 speed limit, so of course, I went 95 for a short section. Was a nice, first, quick trip for Fathers' Day.
Sorry for the incorrrect first numbers, 550 miles on a tank woulda been danged impressive for sure. peace, e