Gasoline Alley - Free Spot the Differences

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Gasoline Alley

We've pumped 15 alterations into this museum collection of historic automobile-related signs.
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The older Java version of this puzzle is available if needed.

  All-Star Puzzles has no copyright claim to this image, which is used under
  the terms of the Creative Commons license detailed on http://www.flickr.com/
The image is courtesy Bernard Spragg --
  for more Bernard Spragg photos visit http://www.flickr.com/photos//volvob12b/
To view the original image: https://www.flickr.com/photos/volvob12b/8068347690/in/album-72157631724098990/