Quote: If I took the vac advance off I would have easily went from 15 MPG to 12 or less real quick. In other words, 20% less, if not more.
I drove over 6000 miles in the RR this summer.
I'll let you do the math. Remember to take off the dollar or so that the hose cost to run the advance.
I'm really not sure why ANYBODY would say it isn't worth it to run on a street car. It is easy to adjust so ????You wouldn't tell somebody to leave the wrong jets in a carb, why is vac advance any different?
Exactly !!! I actually modified ( drilled ) my primary metering block on my 800 Double Pumper so I have a vacuum advance. Works Great. Last Highway drive I did got me 15 mpg with my 3.91's and 235/60/14's. You don't get any kind of mileage when you're turning 3000 RPM at 55mph so I'd say I'm doing OK.
