Funny you should ask. It gets great MPG. That is compared to a stock 55 Buick without an all aluminum, LS1, fuel injected, computer controlled, engine. When running in ranges from 90 to 100 MPH for long distances, I'm at about 19 MPG. That is what we call Highway miles.
I ended up writing about my first MPG experience here http://blog.55buick.com/index.php?/a...t-100-MPH.html.
If it makes you feel any better, I do put 91 octane fuel in it. This baby is not a cheap date.



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