i think u r doing fine and would be nearly impossible to do better. i am averaging (per car) 5-5.5 MPK around town.
i always use eco, only rarely am at 100% (carwings texted me to notify me of a full charge at 6:38 AM but it is Saturday and we have a full plate on the schedule.
keep in mind, there is a potential to get high MPK in town which could backfire on you. i have a relatively static commute to work. its 9.1 miles and i drive it at 5:30 AM which means effect of traffic is minimal. but there are still lights on the way and most are traffic controlled.
so, no matter how well i attempt to time them, i frequently can be caught at lights from cars pulling up to the intersection. i can only guess, but i think EACH full stop is costing me around .1-.2 MPK
with only minor variances in speed, temp etc. i have done as little at 4.6 to 6.1 MPK on the car. i reset car efficiency meter daily, so its always at zero in the morning.
the other thing i notice, when i do a reset, unlike any other efficiency gauge, it starts at zero and i must work my way up to a high rating. now, let me explain.
i start up, its 10 mph out of the alley for about 3 blocks, then thru the neighborhood at 25 mph (i rarely stop unless there is other traffic and that happens maybe once a month if that and never on Sunday) with 90% of this time the car is telling me i am doing 8MPK. but the meter starts at zero and slowly builds up.
that is obviously a calculation error amongst several other confusing numbers the car provides.
i opted to get the 240 volt option but i will still use 120 volt charging as my primary option simply because i can track every penny it cost me to run the car which is the ultimate data most people want to hear.
all the rest of the numbers i still like because of the geeky, statistical nature i have, but i would not lose sleep over any of it
2011 SL; 44,598 miles. 2013 S; 44,840 miles.2016 S30 deceased
. 29,413 miles. 2018 S40; 15,000 miles, 478 GIDs, 37.0 kwh 109.81 Ahr , SOH 94.61, Hx 120.15
My Blog; http://daveinolywa.blogspot.com
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