what fuel consumption do owners get or expect from 3.4 auto around town.
I have never bothered to check , just keep my tank topped up , its a Jag 
Probably depends on how heavy the traffic is, how long the journey ( ie choke on ) I used to get 20mpg in my 3.4 auto open road cruising; I would guess around town somewhere between 12-16 mpg.
Can’t help with “around town” - mostly touring for my 3.4. Got better than 23mpg on 98 premium. Suspect the town number might be 16 or so - never drive it in heavy traffic. Paul.
Here in UK . 15 around town. Less in winter when the choke is on more.
Possibly 20 on a steady run at 50 mph.
Not to be a killjoy, but if discussing mileage it might be worth decided which gallons you’re talking, or go metric 
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Metric? That’s a tall order 
16l/100km in town. I felt, when I adjusted the (2) carbs more rich to get away without choke, I reach 20l/100km.
On a recent highway run at 60-65 MPH with my MOD 3.8S on a newly rebuilt and tuned engine the car returned 19 MPG on US gallons of 91 octane 10% ethanol fuel. Might in the past at some point seen 20.
15 mpg (British imperial gallon).
Dave
Up to this point we’ve all been in big gallon territory. 
As Ethanol was mentioned , Esso red dot has no Ethanol in it , in the UK 
On a 1967 Mark 2 3.4 manual with overdrive on a 120 mile journey on the open road, 21.5 MPG (US) is the best figure I’ve achieved.