Looking into adding a supercharger to a 454 mag carb engine. How much is the sc going to effect fuel mileage at cruising speed and at wot? I don't mind if it sucks it down at wot, but would like to retain some efficiency at cruising speed....

I find its better milage with the super charge it allows you to run more pitch so your cruse improves

or you can run a procharger which boost dont come it until 3300 ish rpm's,,will also save your drive..

I put a Procharger on my 454Mag MPI and my fuel economy has actually IMPROVED......except when she goes into boost.....

I find this to be true too, my boat gets about 3-3.5 mpg cruising w/ blown 540 compared to 2 -2.5 mpg stock 502, Smitty

Hot Damn !!! Can't wait .... 10 MPG !!!!!!

WOW all sounds good. So...keeping budget in mind...what is the best settup for me.

No such thing as a budget when it comes to superchargers ! Just add it all up and x by 2 might put you close .

Ouch! So plan on 10k huh? Sounds like buying a Nitrous system...sounds cheap until you add all the things you want/need above the initial kit...

I am with you there. If you have a top mount charger add in the price of glass work and paint. Oh, and cockpit cover. Oh yeah mooring cover. I spent way more than I had budgeted for my install.