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A Packard 110 ought to go about 16 to 17 MPG at 50-55 MPH. A 120 would do about the same.

The bigger cars would use more fuel.

Any car I've ever owned gets poor MPG in traffic and at higher road speeds.
Short trips eat gas.

Higher compression would benefit fuel economy. Careful driving will make a difference.

Hello

1941 Packard Data Book (get one of these) lists the following tire sizes on page 180 as:
110: 15X6.50 - 4 ply
120: 15X7.00 - 4 ply
160/180: 16X7.00 - 4 ply and 6 ply

Now to your question. Yes, there is a high-speed rear end gear set for the 1941 Packard. It was originally produced by Phhil Bray of Grosse Isle, Michigan and is now produced by EDL Services of Troy, Michigan. You can contact them herehttps://www.edlservicesllc.com/o-r-f-manufacturing

Hope this works out for you. --Roger--

I am usually wrong...I do not believe Phil/ORF ever made high speed gears for the small axle (beginning with 40-110 thru 52 or so)

Oh, they'll make you one when they get around to it.


For about six grand.


I can buy a lot of petrol for six grand.

Determine exactly which axle ratio your car presently has.

Knowing that, you can decide which of several solutions you can choose from.