I am curious if you guys see any increased fuel mileage after installing the after market air intakes. I have a 08 5.4L and a little increased fuel mileage would be great with prices as nuts as they are. Obviously my expectations were not that high, but every little bit counts. Thanks for your comments or experiences.

 

wondering the same thing, i just put on a K&N CAI. see if that helps a tiny bit

 

Let me know if you notice any noticable difference at all. Might be worth the money over a long period of time.

 

yeah definatly will let you know

 

you'll be able to go another +/- 50 miles on each take of gas...

 

well i dont have a v8, but i installed a k&n 77 series on my 4.2 and depending on how i drive, i will range anywhere from 0.5 to 1.5 mpg. it depend on driving style and whether u drive majority city or highway.

 

I've installed 3 different intakes on 3 different vehicles I've owned. Alone (no other mods done) none have showed more than an honest 1 MPG increase.

efans would be a better choice if you were after a mod for MPG...

 

About 1 mpg or so measured over many Tanks of gas. BUT only after I Cleaned my MAF. I had a K&N drop in and my truck did not run so good after a few thousand miles. I removed it and installed a CAI from AFE, then cleaned the Maf and I have been happy ever since.

 

I'm running the Outlaw CAI, EDGE tuned, Flowmaster 40 true duals. As long as I drive the speed limit and keep my BIG foot out of it, I'll get 17 to 18 mpg on the interstate. and 14 to 15 pulling the Triton TR 21. My next project is electric fans.

 

Here is my breakdown on gas mileage by mod:

Stock I was getting 14
After K&N and Muffler I made it to a whopping 14.5
With the tires and tuner I jumped to 15.5
The underdrive pullies netted the largest gains and brought me to 17.5
Half of my daily drive is stop and go the other half I am able to set the cruise at 55-60. Looking at doing Efans next.

 

I averaged around 375 miles to a tank of gas before my K&N 77-series, and afterwards I top out at 410 miles before the LOW FUEL light pops on. Adds some zip to your engine as well and sounds awesome at highway speeds with the large head sucking in air sounds like a jet to me

 

It seems that any mod that increases hp/tq and throttle response decreases city driving mpg because of LFS (lead foot syndrome) but is useful for freeway.

you guys are all talking about E-fans... someone give me a quick lowdown on why everyone wants em? cost? ease of install? long term damage to engine, or increased engine life?

THANKS!

 

Efans are one the best bang for the buck performance mods out there. They eliminate parasitic loss from the factory mechanical clutch fan. This in turn equals more hp/tq to the ground and more mpgs.

A complete kit online will cost around $350, but several members have made their own for around $125.

Installation is not recommend for a novice. Some good underhood experience is necessary as there's both mechanical and light wiring work to be done. Nothing most, "weekend mechanics" can't accomplish in an afternoon.

There's no damage to the engine, probably no increase to engine life.

The main thing about efans is they can be relatively cheap, get you quite a bit more hp/tq to the ground than other mods in the same price range, nice throttle response increase (at all rpm, all speeds), nice increase in mpg (1-3 is not uncommon), and cooler AC. They're definately a mod worth looking into.

 

I was told by a hot-rod friend that works at Summit Racing ... The K&N drop-in filter is the best way to go to get a few more MPG's. If you replace the entire air box with the K&N set-up, it will not increase MPG's because the computer will ask for more fuel to offset the increased air-flow.
He also said to put on a Cat-back exhaust plus E-Fans to give you more... I have noticed approx 2-3 MPG gain on mine & still have the E-Fan to add at some point down the road

 

My experience has been this..

Added a Borla cat-back and gained 1.8 mpg highway right away.

Then added a 3" AF1 intake, no noticeable gain in mpg.

Then added Troyer's tuning and gained another .5 mpg or so.

Though I have to say that adding the tuning causes me to plant my right foot much more often than I would ever have done before.

So I'd say that a quality straight-through exhaust is the best bang for the buck, mpg wise.

Although any of the good custom tuners on here can write ya up a fuel economy tune. I've just never seen anyone here who's used one.. I'd be interested to hear from anyone who has, what difference it makes..