Quote:
Originally Posted by 335dFan
Got 40 even on an interstate run from SC to MD. about 500 miles. When cruising I was between 65 and 75, with some bursts higher and portions lower, as well as some non-interstate at the last 60 or so miles. That's my best tank, but others on the same trip were 36+, 38+, and 39+ with varying road conditions and fuel input. No cruise control. jBD at 80%, but that's probably not relevant. Michelin PSS about 38 psi all around. Power Service additive every tank. Just providing some possible factors, mostly probably statistical noise.
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Interesting, which additive do you use?