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Well, here near Tampa most of my driving has been at 55mph but took 2 trips into south Tampa on I75 doing 70mph--a 52 mile round trip and still had 8 miles left. Granted, in the colder regions the available miles will be less. Now I'm up to 63 miles. Love this car.
I'm also near Tampa, and I think our weather plays a major role in our EV efficiency. I do mostly local driving on my work day commutes and have been getting 64 EV miles consistently in the past 4 months I've owned my 2017 Volt Premiere.

The few trips I've taken on the highway were very sobering. Speeds of 70mph seem to suck the electrons out of my batteries very rapidly and there is no return with the lack of regenerative braking.
 

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We're easily hitting the 53 EPA, on average, since getting our 2017 LT in early October. Of course, weather and driving style can make range highly variable. Here's our guess-o-meter during unseasonably warm weather with little highway driving:



Here's our guess-o-meter during cold weather with left-lane highway driving:
 

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I'm also near Tampa, and I think our weather plays a major role in our EV efficiency. I do mostly local driving on my work day commutes and have been getting 64 EV miles consistently in the past 4 months I've owned my 2017 Volt Premiere.

The few trips I've taken on the highway were very sobering. Speeds of 70mph seem to suck the electrons out of my batteries very rapidly and there is no return with the lack of regenerative braking.
Hmmm, I've still only been on I75 twice, fortunately, since I had mine but there really wasn't much difference in the battery drain compared to doing say 55 on my local roads. Unlike in the vehicle I just got rid of to get my Volt--a Ford CMax. The faster you went, the faster the battery would drain. I'm up to 65 EV miles now without doing any of the hypermiling techniques I did in my CMax. I use the paddle to slow down most of the time unless some idiot is right on my rear.
 

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I generally get better than 53 miles on a charge even in the cold weather. I have gotten as high as 83 miles in the summer. ---/cut/
My VOLT is a 2017 model, it was manufactured May 15th, 2016. My mileage reflects what RalphB has seen. In Summer temps, 70 deg F or better, I routinely get over 80 miles per charge (verified by the odometer miles) and now in winter, getting around 40 miles. You will see a better reading if you leave the heat off, lol, but not many of us are willing to sit in a cold car.
I realize that my numbers would be impressive if not for the fact that I am easy on the car out of habit. My 98 Eldorado had a Eco reading that gave miles remaining and Ave Mileage estimates. Driving easy would show high mileage range, driving hard would drop the mileage like a rock.
I found that driving the VOLT is much like driving the Eldorado. THE BIG DIFFERENCE is in the regen and the ability to regen and coast. I have noticed that most of the attention has been on the regen capability but when you coast, the miles are calculated vs energy used / saved. These miles will be added / removed as calculated to your range as an on going range estimate and will reflect the added / deducted electric range.
I noticed that the ODOMETER miles are always very close to the summer mile estimates and sometimes are more than the EV range miles. This is all changed when the ambient temperatures change, or WINTER temps. The Cold air temps affect the battery chemistry and when the user puts on the heat the miles range will drop by HALF (my observation).
The way you drive the car has big affect on what you will see in mileage. True, the car is engineered to give a certain amount of mileage and if we all drove the same, like robots, we'd probably get the same mileage under similar circumstances. But I feel the BIGGEST cause of lost mileage is the drivers driving habits. Everything else is pretty much the same as far as the car is concerned.
SPEAKING OF ICE.... My car, so far, has never been driven on the gas motor. My miles have been all electric by choice, but I do not do a long commute on a high way where speed limits are 70mph.
In the back of my mind, I realize that the Electric is best used in the city or on flat terrain. I have even read where it is best to use electric if you are in stop and go highway traffic as the regen will frequently be in use. Some comments had said they saw their battery show an increase in range. But for hills and highway, the ICE is most likely the best power source. Just my thoughts
 

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Runion, do you drive in D or L? Guessing D since you refer to coasting.
I drive with the shifter in "D". "L" has an aggressive regen which limits any coasting abilty. I also use cruise as much as possible, my thought is it can change from forward motion to coast/regen very quickly, automatically. I tend to use the paddles on the steering wheel, with braking ability, to disengage the cruise more than I do for braking as the braking is also aggressive, very similar if not the same as being in "L".
I've been getting decent mileage averages and Odometer "true" mileage readings with this VOLT. I don't know if I am getting the highest estimates but I am happy with how the car is performing. I keep watching the forum to see if anyone has any better ideas to improve all this but as I say, the VOLT is engineered to perform at one level. The only things that can change this is the ambient TEMPERATURE (this is a really big factor), terrain/road or highway and the drivers driving habits. I believe it is as simple as that.
 
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