with two bros exhaust what effect does on mpg ?
1942530
I have only seen slight improvement not mpg, maybe 3-4 mpg more. The big improvement comes from horse power and torque.
645763
It depends on the exhaust pipe size. I have 2 on my 5.7L V8 Yukon and it runs great.
926062
I have noticed no difference between the Supertop and the tonneau cover I had on prior. However I noticed a 3+ mpg bump when I added the tonneau. If you have nothing on now adding the Supertop will reduce tailgate drag without adding a lot of weight. I would assume you will see a similar 3+ mpg bump.
1854735
We just used it on a long road trip. The exhaust was not noticeable at all. The cooler worked great. We also got the adapter so we could plug it in to a regular outlet while we weren't driving. Saved the car battery.
163513
I could see no noticeable MPG change when using this box. I consistently take 400 mile trips and have done so with and without the box. MPG seem to stay within my avg total over several trips.
540479
I installed the cat-back and intake on the same day so it might be different with only the intake but I noticed a 2-3 mpg gain after I got over getting into it all the time cause it sounds so good.
1967245
I have a 2010 JK with cold air intake and larger tires and it did make a noticeable difference. The shift points have changed and at freeway speeds I am not having to floor it to make it up some hills. The throttle response has improved too, not a kick in the pants difference but one that you can tell. As for mileage, I measured it for 3 weeks before I programmed and I was getting about 17.1 mpg after the tune I was getting 19.3 mpg. I drove it the exact same so I can say with 100% clarity that for me it did improve the mileage.
2021510
I have a 99 Silverado 1500 5.3L and i was getting 18 MPG. However i put a 6" lift with 35" tires on it. My MPG dropped down around 13. After i put the programmer on i usually get 15 MPG driving conservatively. However, after i perform a oil and oil filter change, and clean my K&N; air filter i will get a high 17 MPG for several fill ups then it starts dropping to 15.
1047855
You won't feel anything really. There's a difference in mpgs through custom tune and the speedometer calibration. Throttle response is slightly better.
1788839
It will give a gain in power to help with towing you may see an increase in mpg as long as driving style stays the same it dose have a programs from towing on it or like me a cold air intake and from what I can tell is it has helped with going up will not shifting as much and still getting 19 unloaded and about 15 with the bed full of wood
1353870
Will loose about 4 mpg but bikes come lean from factory so it makes it run richer and cooler. Better for ur motor in the long run. Friend me on Facebook . David dabeast laws
196243
I am using Lucas in my 2.0L turbocharged Audi, my fule economy improved from 19 to 22 average mpg. No pings or knocks. I love it!
1353869
You will sacrafice fuel milage, mine went from 42 mpg to 38 mpg. But worth it to me. I've made mods to the engine and changed exhaust 2 or 3 times and the Auto-tune keeps it running at peak performance. No more costly dyno after mods!
1353866
Overall my mileage dropped about the same amount ~15% that the performance increased according to the run on the dyno after the installation. I put a new higher flowing air cleaner, and exhaust system at the same time. Most of the decrease mileage is caused by me using the extra power. If I cruise gently, I get close to the same mileage. There should be a slight decrease from the fact that H-D runs the engine leaner than what is good practice for keeping the engine from overheating. At least that is the story that I have been told by several people. The Cobra tends to add a bit more fuel to the mix which is probably worse for emissions and mileage, but better for engine life. YMMV and YPerformanceMV Overall my mileage dropped about the same amount ~15% that the performance increased according to the run on the dyno after the installation. I put a new higher flowing air cleaner, and exhaust system at the same time. Most of the decrease mileage is caused by me using the extra power. If I cruise gently, I get close to the same mileage. There should be a slight decrease from the fact that H-D runs the engine leaner than what is good practice for keeping the engine from overheating. At least that is the story that I have been told by several people. The Cobra tends to add a bit more fuel to... » Read More Overall my mileage dropped about the same amount ~15% that the performance increased according to the run on the dyno after the installation. I put a new higher flowing air cleaner, and exhaust system at the same time. Most of the decrease mileage is caused by me using the extra power. If I cruise gently, I get close to the same mileage. There should be a slight decrease from the fact that H-D runs the engine leaner than what is good practice for keeping the engine from overheating. At least that is the story that I have been told by several people. The Cobra tends to add a bit more fuel to the mix which is probably worse for emissions and mileage, but better for engine life. YMMV and YPerformanceMV « Show Less
2011426
At any given time 85% of my driving is city and I get 18.5-19 mpg. This has been consistent since I've installed the intake. I don't have a before/after comparison because it was installed only a few days after the purchase of the vehicle.
353280
No. Still getting 35mpg highway 27.7 mpg overall. Same as before the hitch.
1853668
It helped my 2008 dodge nitro. I got about 2-3 mpg better plus it shifts firmer.