Join Date: May 2019
Location: NW Florida, Central OK, and Eastern NM
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1) Where are you located?
2) How long are your commutes?
3) How far between stoplights on average, and how long do you have to wait at most stoplights (5 seconds vs 30-60)?
When cold, engines are roughly 40% less efficient. This is due to retarded ignition timing and extra-rich conditions to speed warming and to heat up the catalytic converter as quickly as possible. In my experience (admittedly mostly with slightly less modern engines), this tuning condition exists until the engine reaches about 130 degrees F. Thus, questions 1 and 2; if you live in a colder climate and/or have a shorter commute, much of that commute will be driven with the engine running at about 60% efficiency.
As to question 3, obviously if you have a stoplight every 1/3 or 1/4 mile, obviously your vehicle will hardly have time to get up to speed before you have to brake again. And if you have to wait long periods between them, that is also a factor.
Finally, you mention braking as late as possible. Perhaps a better measure of driving efficiency is braking effort, rather than braking duration. That is, lightly easing on the brakes for a full 1/8 mile is actually more efficient than cruising along and braking hard at the last minute. And, of course, simply coasting to a stop is by far the most efficient, but naturally we have to balance efficiency efforts with not driving everyone around you insane.
I am getting about 33-34mpg in my XLE Premium, about 30-40% highway, but with many instances where I can go a mile between stoplights and stopsigns in my "city" driving. Getting stuck in traffic lowers my MPG several points. I used to get about 43mpg in my Honda Fit, which was rated at 29/33, and I get about 23mpg or so driving my wife's 2016 4Runner in the same manner. Yes, I drive like a grandpa.
Oh, you might genuinely have an issue with the backup camera....