58 Thunderbird Synthetic vs. Conventional Dyno and Mileage Test Sneak Peak 

I'm reproducing a test done by Hotrod Magazine.
I've been asked what's the status on the Mileage test comparison so I'm right in the middle of it. Finishing the conventional portion this week (unless there's snow).. Dyno test is complete. More to come!!!
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The article that caught my eye: The Truth About Synthetics: Way More Than Just Extra HP! (done Jan 3rd, 2017
www.motortrend.com/how-to/tru...
He used a 06 5.7 Charger. My test is a 58 Thunderbirs or "Squarebird" using a 390 Ford FE engine. Running two tanks of gas for each test..

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