I get only 13-13 1/2 MPG using Chevron Supreme in my modded '66 306 with a C-4 and 3.25 T-lock. Some with an old stang probably do better. I love the classic Stangs, but sacrifices are necessary to use as a daily driver. My $.02.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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