have a friend who wants me to buy something called a fuel shark he says it works he tried tried something called fuel doctor that did not but he says the shark dose anyone know for sure cant find anything on the net whats the avg mpg for a 01 4x4 ranger with auto trans getting 12-15 in city 17-19 at 55 mph

most of those "chips" and such do absolutely nothing in a vehicle with a PCM. You can get your PCM tuned by a professional (or hand held tuner) and that will usually help a bit (if you have mods like headers, exhaust the benefits will be even greater from a tune).

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2006 Fx4 Level 2 with a 5spd, Superlifted on 33's.

No matter how easy I drive, I have yet to get 20 mpg.

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2006 4.0 5 spd auto 4x4 Super Cab
BF Goodrich Commercial Traction T/A's
Royal Purple Throughout
Alpine Head Unit with some Infinity Noisy Stuff
NW Oregon

The numbers you posted above are normal for a truck with a V6. What did your friend expect? 28 mpg? If so, he is delusional. Tell them to trade it in for a four banger if they want numbers like that. Even then, they will be pushing it depending on how they drive and the terrain they are driving in. I'm lucky if I see 24 but the average is 21-22 with my 2.5L four cylinder.

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Sgtsandman's Work in Progress
2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
2019 Ford Ranger STX FX4, Super Crew, 2.3L Ecoboost, 10 speed automatic, 3.73:1 with rear locker, Leer 100XR cap

Really? No. It's the biggest load of bullshit EVER. Seriously. The only thing that does is make the user look like a retard to his friends.

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(Formerly)
FireRanger
2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide

There is an old saying:
"Cheap solutions get cheap results"

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1999 Ford Ranger XL
Vulcan V6, K&N 33-2106 Filter, 3:73 Gears,
FRONT 3'' Susp Lift/REAR 3'' susp.+ 3" blocks,06 Mirrors
31"/10.5"-15" BFG on AR-172 Polished Rims,Smitybilt Console
95 Mustang Saleen Seats,Alternating Blinker MOD
Pioneer CD/iPod/GPS,6.5 Polk Audio/6.5 Sub-Woofers,
Stainless Bed Extender,Throttle and Dome Light MOD,
12" Tool Box,Billet Grille,NightShade Tint,Projector Headlamps
6000K H.I.D. so i can see at night! LOL

JESUS is LORD!