New York City Subway Map, 1951, inset as part of the Esso Gas Station Road Map for New York City, 1951

I thought the Esso road map from London was the only "gas station" map that included a subway map. 

It turns out, NYC too.  And, I'm going to have to do further research because it's possible that the NYC map with subway information was published earlier than the Esso London map.

Both produced by Esso's map division, General Drafting Co.  

That division also produced subway exclusive maps for banks and other organizations in New York City.

It's possible that a gas station map includes rail transit information for Chicago, Paris or Montreal, although the Montreal system didn't open until 1966. I'll research that every so often.

-- "When Maps Reflected Romance of the Road," New York Times