ok so i have a 305 tbi and im looking at geting a 312 carb thats making about 300hp and im a bit concerned about the mpg drop i was just wondering if anyone would know what kind of mpg the motor would get ? or should i swap the 312 to tbi? the car is my every day driver so some kind of gas milage is good so im just looking to get the best gas millage with that power.