Ok here it is:

I have a new battery in the car after letting the car sit for 3-4 months.

New battery, dash voltmeter reads 14 V while driving.


I drive for 25 minutes on the freeway and shut her down, fill up gas and can barely start. Dash volt meter sitting about 10-11 V after shut downs.

No matter how much I drive, car struggles and barely starts.


I doubt it's a drain because what can drain a battery in just a few minutes?

When checking for a drain, should I have a friend shut the car down while I have a DMM in series with battery?

Or can I do it myself after shut down?

My fear is that if I disconnect battery after shutdown, it may stop the device from draining and I won't see it.

It could be a bad battery but it just replaced a bad battery so I'm skeptical and think it's in my car.

A short?

Just shut down after 30 minute drive. Check dash volt meter and it's at 10 V.

Charging at 14V while driving.

 

From your description, my first thought would be the new battery is faulty.
There is nothing that can drain a good battery in a few minutes, except running the starter for 5 minutes straight which obviously you are not!

On thing, verify the 14 volts shown on the gauge is actually getting to the battery. What I mean is, use a DVOM (digital volt ohm meter) and check the voltage at the battery with the engine running, just to be sure. A thought,,,,,,,make sure all the cables are hooked to the battery. The large power wire from the alternator to the positive battery terminal and the wire to the starter are separate. The alternator cable (wire) bolts to the terminal.