gas mileage Mechanical vs Vacuum Secondaries

the blades aren't open much to make hp for a 60mph cruise.

if it's milage we are talking, the street dp's are fine with the leanness not being enough to cause damage to the engine but decent 'for what it is' fuel economy.

this true.

Hey the other way is lose the PV for a plug and go up 10 jets, but then of corse...