Can you imagine a population of Viggens being driven for economy? We all buy 'em, and go on a road trip as a convoy.
Somebody rolls past in an M3 or a Corvette or a 370z or what have you, and sees a troop of Viggens chugging along at 50 MPH. The look on their face would be priceless!
On a more serious note, congrats on the accidental discovery! Most people say that to shift for economy, pull the lever between 1700 and 1900 RPM. You'll have to experiment, but there's a start.
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