bigcanoe

If I get a CAI + tune will I see improved MPG given the same driving style and conditions? Will the 93 tune improve MPG more than the 87?

I get 25 mpg repeatedly with my stock engine.

Nuke

Let me understand: You want to spend about $600 for what others buy for PERFORMANCE in order to save perhaps, maybe 1-2 MPG? What's the pay back? About 5 years? Sorry, economy tunes are a dumb idea since being given the finger as soccer moms blow past you is just wrong.

Regardless of the tune and octane, most custom tunes are about equal in fuel economy despite the performance gains (unless you just keep putting your foot in it ALL the time). I do, however, find my 87 and 89 octane tunes more equal to my stock tune in mileage although the performance is way better. With my 93 tune, it's m ore of a gas hog since it winds up better in the upper RPM ranges so when I run my 93, I'm usually gettin' on it a lot more.

Nuke

And besides, we bought out Stangs for the wood they give us, NOT for economy.

bigcanoe

I am trying to straddle the line...

I drive 1500 miles a month, and this is my only car....plus I dont want to own a junker and a Mustang and drive only the junker!!

$5.00 gas is coming? Maybe?

I dont think logically, but extra MPG can help me justify a CAI/Tune

Nuke

Most people justify a CAI & tune for the extra RWHP.

Trying to save money with a $600 mod is counterproductive. If the performance isn't on your radar, than put that $600 towards that ever-more-expensive gas.

bigcanoe

Ya, maybe the Mustang isnt the right car for me, I am not performance obsessed. But I cant stand the idea of driving a civic or a corola

Nuke

With some good driving habits, you should be able to eek out the EPA rated values, especially if you do more rural and highway driving. I can average about 26 MPG pump-to-pump, hand calculated with my 4.6L if I can keep it at 65 MPH or lower. After I get cruising over 1800 RPM, mileage takes a nose dive.

bigcanoe

I mostly drive like a granny (or grandpa) and I cannot manage to do more than 26/27 with the V6PP. But I do drive 70 consistently. In my car thats around 2k RPM if I recall.

pdonket

I don't see how you're not getting better mileage than that if that's your highway only number. If I reset my trip monitor on the highway in my 5.0, I can get 27mpg on the highway going the most reasonable speeds possible. If you want to make a difference, drop your speed to 65 on highways where that's reasonable, it will make a difference. Most highway trips aren't worth going faster anyway because unless you're on a road trip, the extra few miles per hour are going to equate to saving at most a minute or two. Not worth it IMO.

Chromeshadow

BigCanoe, If you can get a tune that will just advance the timing, you'll get one or two MPG, not worth the difference for the increased price of the 93. I've taken mine on a few 500 mile trips with 87 and 93, our computer is supposed to give a little better performance with 91 or 93, there was no difference in my MPG. I get 31 at 70, I run mobile one synthetic oil and a K&N filter with no tune. If I get above 70 mpg starts to drop.I don't think there is much you can do to improve it much.