I bought this new “racing” ignition coil and spark plug wire because the one I recently installed has a bad habit of working its way off the plug, causing sudden loss of ignition.
So I picked up a “high performance” ignition coil. You see, I am a sucker.
There was a guy in a Vespa forum who swore he picked up 4-5 MPG with this.
Vespa forum discussions of ignition coils are riveting.