Good idea doing the math. But you didn't do it. In fact, by saying there's
"never" a payoff, you went way outside the basic principles of the analysis
and showed you didn't understand it at all. To take into consideration
changes in mpg, you have to start with an mpg number. For example, if you
drive 10,000 miles a year at 15 mpg, that's 667 gallons. At 17 mpg (a 2 mpg
change) that's 10,000 / 17 = 588 gallons, a savings of 79 gallons. If gas is
a $1.70, that's $134 a year. Draw your own conclusions of how many "several
years" it takes to recoup a $50 investment and a $350 investment.

That wasn't hard was it? The only thing you need to remember is that you
can't start with 2 mpg and say "What if I drive 10,000 miles at 2 mpg
more......"  That doesn't tell you how much money is involved.

But at 350 bucks, adding 2 miles per gallon, you'll never have a pay
off.  You'll never drive the truck long enough to save enough to pay
back the price of the intake.  Even if something only costs $50, you
won't see the pay off for several years.  Does this make it a wise
investment?

TC

A guy at work improved his mileage on a Avalanche.

He added a throtle body plate, and one of those air induction kits.
He improved his highway mileage by about 2 mpg. These 2 improvements
cost about 350 bucks. Also, a flowmaster muffler is susposed to help
too, by reducing back pressure. These items will help, but will cost
some bucks. By the way I have a '04 XL  with 5.4. I only get 12 and
17.
I am going to try the induction kit, but havent done it yet. kevin

I agree, you can almost always feel the difference immediately.
I have used Restore occasionally for years, in a variety of vehicles. It does
what they say it does.

I've not heard that, nor have I used it every oil change for any length of time.

Texas Parts Guy

Restore definitely restores compression and gas mileage on engines
with compression problems. But you have to add a can at every oil
change else the effects disappear within 200 miles.

I had a '91 Mazda Protege 195,000 miles, Restore really put the pep
back into the engine. It went from running rough, missing under load,
and using 2 quarts of oil between changes to not using oil, smooth
running, and good acceleration under load.

But I've read post where it has seized compression rings and clogged
oil rings on pistons after prolonged usage.

Unless its a worn-out engine that you're either going to junk or
rebuild completely a year or 2 down the road. I would probably avoid
using Restore.

How many miles you got on that?
Try the other suggestions...plus...try a different motor oil. Several
manufacturers (eg Quaker State) offer special blends for high mileage
engines and/or an oil additive such as Restore can't hurt.
My 2 cents.
Cheers.
Joe

P.S. I've recently purchased a can of Restore, but haven't had the chance to
try it yet.

Has anyone added anything to their 5.4 liter Supercrew to significantly change
the gas mileage? Right now, I get 15 mpg.

Thanks,

RayJ
2001 F150 Supercrew