My /6 is a gas pig when it's cold outside. Why?

Thanks for all the suggestions!

Oops, sorry. Carb is a 1920 model. The body is 73 but this poor thing has been butchered over the years. Not sure what vintage the carb, or anything else is for that matter. I'm just glad to have gotten it going and running really well. It doesn't run bad when it's cold outside. It starts right up, doesn't stall etc., it just drinks more gas.

My heat tube/thermactor set up is down at the moment because I can't find an air cleaner sensor. My parts guy says it's factory back ordered, which means they my have stopped production. The flap in the air cleaner works with vacuum applied. I just need a sensor to control it. Will keep up the search. Later model may be the way to go as suggested, thanks : ) Can I just get the sensor or does the flap need to be of the same vintage.

I will try more timing. I had it at 5 once before with no issues. Forgot why I moved it to back 2 1/2.

Though hard to believe, the gauge really does move. I've driven it enough to know how it should react.

I'll try a few minutes of warm up to see if that helps too.

Choke pull off is doing it's job and I recently adjusted it to open a little further by bending the linkage. Seems to run best that way. I've got a spare just in case it craps out one morning.

The adjustment screws on the choke t stat are rusted so I made adjustments by bending the rod slightly. Think I'll spring for a new one. $20 at rock auto, so I can make more refined adjustments.

It was a fairly chilly weekend here and I had a lot of short trips to make, giving the car ample time to cool between starts. I filled it up before heading to NYC on Sunday and got a 17.6 mpg reading for the weekend's short trips. HOWEVER, once on the road she was a champ: 23.2 on the way there with about an hour in traffic and 26.2 on the way back with no traffic. Average speed 55. That was an all time best. I must have clicked that pump 2 dozen times trying to get more gas in the tank because I couldn't believe it only took so much. Nope, it was full. For the record, the car was warmed up when I fueled up at home and I only stopped for 10 minutes in NYC to drop off a passenger so it was an economy run best case scenario of pre warmed engine and highway driving.

Anyway, thanks for your help. I'll play around some more this weekend and keep you posted.

Al