I am moderate hypermiler since Aug 2008 .... My max was only 40 MPG even though I tried to push it. Using this configuration I get at least 45 MPG all the time. The restriction after the MAF gets me 44 already but with less power. The hydroxy gas injection adds power and the rest of the MPG. If you are in the northern VA/DC/MD area we can drive the test route (central MD to central VA) so you can see
You might want to check this PhD study. This might probably explain the hydroxy side.
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