How many miles are you getting with 1 tank of gas?

I usually fill up at about the 1/4 mark and get 24.5 MPG in my Sig. That's a miserable range of only 275 miles or so.

My biggest gripe is the tiny fuel tank. It should be 18 vs 15.

By contrast, I can get close to 700 miles range in my F150.
 
I get that in my 14' and I consider that a good range(~24 MPG). I used to get much lower before(22MPG). LA traffic.
 
I get about 330 Miles to a tank. Two guys at my dealership keep asking how my gas mileage is. I started a thread on this before but no one answered. Are they subtly trying to tell me something. Is there an ECU update or something I should be asking for?
 
'19 AWD Touring, getting a projected 450 per tank (I have yet to run it low enough for the low fuel light). 90% of my driving is on the highway, so I'm getting about 31/32 mpg per tank
 
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