Pascal: Jesus, Buckman! This stuff has been on the Stingray since Korea! This can expired in 1966!
Buckman: What's the matter, sir? It still tastes like cream corn.
Pascal: Except it's deviled ham.
Pascal: Buckman! There was a fingernail in my food, you fat-ass moron! Yesterday, it was a band-aid!
Buckman: I'm sorry, sir. The band-aid was holding the fingernail on.
Sonar: Sir, it's the Orlando. Somebody just dropped forty-five cents.
Dodge: Are you sure?
Sonar: Oh, yeah. A quarter and...two dimes.
Answer: Adding alcohol to gasoline can lower the fuel's viscosity, thinning it to flow more easily. It can only marginally increase an engine's speed and power.
raywest ★
But the question was, would it have actually increased the sub's speed?
Thinning the fuel mix would not increase energy or performance, so it would not make the submarine faster.