How do i make my mopar a daily driver??

interesting. this is the first i've really read this. i daily my car til the snow falls/salt comes down and i do lots of short trips because i live in the city. is this a common known thing that they just get bad gas mileage on short trips? i know on the highway i steady get 20-23mpg in my slant six (dont know the gears off the top of my head) but in the city for short trips im getting 12-15mpg and i just keep assuming something is wrong with the car, but those short trips are often less than 30 minutes. and i drive that car like an old lady going to church to make sure everyone can get an eye full so im definitely not heavy on the gas.

It's normal for fuel economy to be lower in town because you use more accelerator pump shots and intermittent higher loads in town.
On the hiway you pretty much stay at a stable RPM and load.