Local food often has higher transportation costs than food from further away. Long distance food transportation is done by highly efficient ship & rail. The last mile transportation costs typically dominate. And semi-trailer from warehouse to grocery store is far more efficient than half-ton truck from farmer to farmer's market.

And then both are dominated by the drive from the grocery store to your house. If you care about food carbon emissions, walk/bike to your grocery store. That'll have far more impact than food choice.

Type of food still has sizeable impact even if the food miles issue has been misleading. Cutting red meat and dairy likely beats cycling for errands for example.

The switch from an ICE car to an EV (and assuming a standard US amount of driving) probably beats possible diet changes.

You can of course do all of these things.