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Jan 19, 2003 | 08:59 PM

hogdog_48

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inline six

I got a 93 F150 4.9 and get about 10 or so mpg. Has dual exhaust with turbos. Think I might have to put the glasspacks back on.

Jan 24, 2003 | 07:05 PM

mantta

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From: Keweenaw Bay, MI

inline six

If you are running standard mufflers, put the glasspacks back on. With a turbo, you need as little back pressure as possible or your efficiency will really drop.

Jan 24, 2003 | 08:06 PM

Silver Streak

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From: Broken Arrow, OK

inline six

I think he means he has turbo style mufflers. Some of the turbo mufflers suck bad. Many of them have the same design as the original did 30 years ago. I have a Magnaflow on my Lightning and really like it. I have a 2 Chamber Flowmaster on my 4.9 and like the power, but despise the noise. Lots of gain can be had by running new muffler technology. What size are the duals? 2.25" should be more than enough for any 4.9. If you are over that or significantly under that it will cause a mileage drop.

Jan 24, 2003 | 09:42 PM

Syrnok

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inline six

If thats american gallons it's not too bad. My 93 4.9 auto 4bi with 3.73s and flowmaster 3" and K&N with a power chip on 92 octane get 17 on average hwy and 12.5 pulling a 3600lb 5th wheel around B.C. which included the icefields parkway to Jasper and back. That's canadian Gallons which I think are about 20% bigger.

Jan 25, 2003 | 03:38 PM

truckfreak69

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From: Florida

inline six

That's about what me and my friend get, mine is a 93 and his an 88 both with 4.9's...... His has stock muffler and mine has a Gibson 3" aftercat.....

Jan 25, 2003 | 03:51 PM

hogdog_48

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inline six

Yeah I got 2.25'' pipe all the way. Its funny. My buddy is gettin about 6 mpg on his 90 Ranger 4x4 v6/auto. Im to the point Im about ready to pull that efi piece of junk and put a carbed 6 back in its place. And Ill do it too!