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Get the manual Impreza. I love mine. It's so much fun to drive. I'm blown away by how good the gas mileage is too. My corolla is slightly below the official Canadian estimate for city mileage, but my Impreza is beating it by more than 20%.
Regardless of the gas mileage accuracy, I wouldn't want a manual anyway, unless it was the automatic-manual that can be bought with some of the Subarus - no clutch, just flip the paddles on the wheel and it acts like a manual.
I've got little interest in a manual transmission.
(I'd take the bus to work if I didn't have to walk more than 2 miles total to and from the stops, and transfer from one bus to another in the city's center, and more than double my total commute time.:\)
I'm the sort who drives because I need to be somewhere else, not because I
want to drive.

And the Impreza's got a lot of practical features I like, and AWD for a little help on the road in Erie's winter hellscape.
What gear do you downshift an auto at 50MPH?
I've got an Overdrive button on the shift column, which is useful for things like downshifting just a bit on a highway for a quick boost if I really need it. That just bumps it down by one gear. However, the car is usually good about figuring out what to do if I just give it a bit more gas at that kind of speed, unless I'm on a hill. Then I have to hit Overdrive if I want more response.
On the Impreza, my understanding is that bumping it to manual mode will automatically put it into a transmission ratio that approximates a gear from 1-6. Then it can be downshifted as needed.
In general though, I rarely feel a need to do any manner of non-automatic shifting at that speed. Most of my downshifting is done at an intersection, when I want to be sure that the car is going to
move when I want it to, rather than sit there for a bit as it tries to decide between 1st and 2nd gear.
You don't literally feel much through the clutch pedal. You feel what the engine is doing in response.
That might have been a useful thing to have known back then, though usually the only thing different I felt from the engine was it sputtering as it stalled out. :\