Yep, I almost never go over 53 miles per hour.
And I stay in the far rightmost lane of 4 to 7 lanes.
Also leave a TON of space in front of me so I almost never have to use my brakes.
If the traffic in front of me slows down I also ease off the accelerator, WAY before I get to the car in front of me.
If I EVER have to use my brakes on the freeway I consider it to be a failure.
It means I was following too close, and the gas I used to get up to that speed I was going was wasted. (Well SOME was wasted considering regenerative braking.)
Over 2.5 years I am getting better at just never getting up to unnecessarily high speed given the traffic flow.

Also very very slow acceleration from a stop.
Frequently I'll creep from a stop and when the cars to the left of me have passed I'll get into that lane to get out of the way of the cars behind me.

I chose routes with fewer cars or less aggressive drivers.

On the freeway I prefer driving in bad traffic now.
No pressure to go fast.
When there are very few cars in on a Los Angeles freeway everyone gets giddy and even the right lanes are zooming at 65 or 70 miles per hour.
Ironically I stay out of the carpool lane 99% of the time, even when I could be going faster there.

Just keep practicing.
I've had 2.5 years to experiment.

Need fewer troops to support.
Drive a hybrid.
Best tank 71.65 MPG.

Before this car I spent two years learning hypermiling on my 2004 HCH1.