Hi, I recently bought a 2001 mustang
base. V-6, 5 spd, 120k miles, beautifully BONE STOCK in every respect and I intend to customize it into something I enjoy driving.
My goal with this car is MAXIMUM MPG. I'm not concerned too much about racing it.
Driving to work all week at 30-35 mph I got 16 mpg on a tank.
Base line road trip was 200 miles and I got 24 mpg @ 80-85 mph
Next trip was 180 miles and I got 27 mpg @ 65-70 mph.
I added a CAI from American Muscle and made no road test.
I got a SCT tuner and a 65mm BBK throttle body. Set to 87 octane tune and the daily commute got 20 mpg out of that tank. Yesterday I did a 200 mile trip on 91 tune going 70-75 mph and got 30 mpg.
I am seeing results with increased MPG across the board, and I know that more air in and more air out = better performance... Exhaust is next.
I have a cracked exhaust manifold and a hole rusting through my muffler. I got an unopened-new-in-the-box
set of pacesetter shorty headers for $50 from a kid at work. So here is my question...
How much do I NEED to open my exhaust in order to get the maximum benefit in MPG before the law of diminishing returns starts to rip chunks out of my wallet? There are far too many options...
Is a catback with shorty headers and factory Y-pipe enough? Do I NEED to do more than that such as true dual exhaust to maximize MPG?