IIRC you have proof of concept, mule, prototype and then first run production line. So the P4 is still a mule and not the prototype. So summer comes with a new engine and tranny. Run it hard and long to see what breaks and correct it for production. As long as its OS is not Windows based all should be good.
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With my Wrangler I average 40 mpg. Triumph Speedmaster 60 mpg + Jeep 20 mpg = 40 mpg!
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