03-12-2008, 04:58 PM
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CC Member
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Join Date: Aug 2006
Location: San Diego,
CA
Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
Posts: 1,066
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Not Ranked
I used Marvels in my Ford diesels with the 7.3 and I actually got a little gain in MPG. I also used it in a boat that I had with a supercharged 510 CI chevy motor putting out 850 hp on AV gas. The builder said that AV gas burned a little dry so he said to use Marvel. It worked fine.
A friend though had some problems with it when he used it in his new Duramax / GMC truck. It caused some injector problems.
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