In areas with 'reforumlated gas', you will probably get much worse mileage due to lower energy content in the fuel. This is different than octane.

Take 10% of the energy out of the fuel, and you'll need to use a lot more of it. Due to air quality issues, different areas are required to use different fuels. Makes it tough to make mileage comparisons between regions.

 

Ajadatz1,
My thoughts exactly.

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Black 1997 F-150 Supercab Flairside. 4.6L with Superchip, Jacobs DIS, K&N Generation II, Cat back Exhaust with Flowmaster 40 and MEG'S Stainless tip in front of rear wheel (nice rumble). 17" Off Road wheel pkg. Lots of body mods. 5 yrs old and still turns heads...and now paid for!! New is NITTO NT404 275/65/17's and Hellwig 1/7/16 front and 1 1/8 rear bar.

 

I have to admit, if I was getting crappy gas mileage I would feel the same way.

I swear I'm getting 18+.

1)2wd
2)reg cab
3)short bed
4)75% highway miles
5)sea level, no hills

oh, and
6) excellent driver

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1999 Ford F150 Lariat RegCab 2WD shortbed 5.4L 3.55LS Towpkg Line-X
15.714@85.21

 

I have managed 17-18 MPG consistently since I bought the truck on the freeway. However, in the city or lead-footin' it, I do average around 14. I've filled up, taken freeway trips for the weekend, and filled up at the same station the next day, and averaged 18. It's not out of the realm of possibility... 65-70, level terrain, cruise set most of the way... It's possible, believe me.

------------------
98 Explorer (Lemon Law Case in Progress)

'00 F-150, X-cab, 4x4, Lariat, Off-road, Trailer Tow, Holandia Sunroof($1000), built 11/99 picked up 10/00!Clear Corners($36), Manik Stainless Steel 1-piece brush guard($700), Custom CB wiring, Uniden PC76-XLW CB radio($100) with K-40 Magna-Mount antenna (for now [$40]), 1 set of 165 watt KC Daylighters (for now... more on the way... $140) Fog Light Switch mod(free!!!), Custom switch mounting plate and overhead console, Bully Stainless Steel Trailer hitch drawbar w/ 2" stainless steel ball($80), Gray Tek Style Soft Tonneau Cover($250), Gray Line-X Bedliner ($450).
List of planned mods: Clear tails, torsion bar tweak, bug deflector, Chrome ORP rims.
93 Probe GT teal, OE rims painted to match, bone stock drivetrain, leaky exhaust.

 

Best ever mileage for me was on a 300 mile trip with only one stop (shut off engine) on relatively flat terrain, cruise control set on 65. Got 20 mpg!! No B.S.

87 octane, tailgate closed, k&n filter (only mod)
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'99 F-150 S/C 5.4, 3.55 Wedgewood/silver

[This message has been edited by fordusaf (edited 05-08-2001).]

 

WLF,

I think most times I see good reports of MPG it is mid-west and CA drivers. The gas here in the northeast really sucks. I consistently get 12-13 mpg. That's 95% city driving. Being from Baltimore maybe that's part of your problem too.
I just decided to change brands, running my first tank of Texaco now. We'll see if there's a difference.

------------------
01' Supercrew Lariat Black
Gen-III
5.4L
4X4
Med. Parchment Interior
Leather Captain's Chairs
Moonroof
CD Changer
LSD
Factory Cab Steps
Bedliner
Bug Deflector
Slider
No Mods
No Tow Package

 

I wouldn't count on it. I'm almost at 10K with my '00 5.4L 4x4 auto and I average 13.06 mpg. My best ever was 13.95 mpg. Here in Hawaii 87 octane gas is $1.92/gallon so I try to drive my '95 Tbird SC (19mpg) as much as possible.

------------------
'00 5.4L AUTO 4X4 Lariat (Black/Silver)
'95 Thunderbird SC
'02 F-350 PSD CC DRW 6SPD 4X4 Lariat (order this year)
www.hawthorn-engineering.com

 

The absolute best I have ever gotten was 18.8. The worst is 12. Gas mileage sucks with the 5.4, but you have to know that and accept it if you want the power and torque that comes with a V-8. Even after installing the K&N air filter and the cat-back duals, fuel mileage never even changed.

------------------
'99 XLT SC 4x4---Sport Package---Bright Red---5.4L---catback duals---K&N Air Filter---17" wheels---Remote Start/Entry---12 disc CD Changer---CONFEDERATE BATTLE FLAG ON THE BUMPER! deal with it.

 

DrJeffro,
The gas does suck here (oxiginated in the winter) and I already use Texaco. Have also used Shell, Amaco and Exxon. Have also driven my truck Coast to Coast during my 90,000+ miles, both towing and not. Still have not averged more then 15 mpg. Some times a little more ad sometimes a little less.

RebelYell,
I agree, I love the power. Love the truck, and woulden't trade it for any high milage car out there (except maybe a Porsch Boxter).


------------------
Black 1997 F-150 Supercab Flairside. 4.6L with Superchip, Jacobs DIS, K&N Generation II, Cat back Exhaust with Flowmaster 40 and MEG'S Stainless tip in front of rear wheel (nice rumble). 17" Off Road wheel pkg. Lots of body mods. 5 yrs old and still turns heads...and now paid for!! New is NITTO NT404 275/65/17's and Hellwig 1/7/16 front and 1 1/8 rear bar.

 

With a 25 gallon fuel tank, if I get 400 miles a tank, I'm overjoyed. In the winter, it's more like 340.

 

Have a 00 hd Ford with Holley Sc, JBA Headers. Average low of 12.63 & high of 16.26 on a 2000 mile trip to Arizona using premium fuel, but speeds (in desert) were 90 + and taching about 2300 RPM.

------------------
KEITH
2000 HD-FORD
HOLLEY THUNDER SUPERCHARGER
JBA HEADERS
BELLTECH LOWERING KIT
1999 ULTRA CLASSIC HD

 

The only way anyone is getting more than 18 mpg w/ the 5.4 is on the back of a flatbed!

I'm consistant @14mpg w/ very conservative driving.

 

well, I envy those who get more than 13 miles to a gallon. Check my sig( I am talking about my F150 ), I get about 12.7 miles per gallon 100% city driving. The good news is, even if I "race" my truck all the time (leadfootitis), I still get about 12.7 MPG. My truck only has 4000 miles and I am hoping that a couple thousand more, I should see better gas mileage. Yes, I drove VERY conservatively for a full tank only to get the same mileage. So , since then I just enjoy my truck. By the way, gas here is about 1.86 per gallon (92 octane). Hope this helps and if anybody has any idea why I only get about 280 miles before the low fuel light comes on and my friend who has a 2000 5.4 expedition with about the same mods (4x2, 5.4, 3.55 LS) and gets 360-400 miles per tank, please let me know. Thanks.

------------------
2000 EXPEDITION 4.6 3.31 Rear, AIRAID Fipk with Poweraid Spacer, UltraFlow muffler, 82 mm Mass Air Flow Sensor housing w/ stock sensor, 6.8 inch TV with tuner/VCP, Full alarm and Auto-Start, Daytime Running Lights

New Addition:

2001 F150 SUPERCAB 5.4L 3.55 LS, Airaid FIPK, 82 mm MAF sensor billet aluminum housing w/ stock sensor, Full alarm and auto-start, 50 series 3 chamber 3inch in/out Deltaflow Flowmaster
Swept Side style, Beltech 2 inch rear shackles, SUPERCHIP, billet grille, Lariat wheels and tires (275/60/17), Billet antenna by TRENDZ.

COMING SOON:
pulleys, remove cats, 2 inch drop all around.

[This message has been edited by Newbie46 (edited 05-09-2001).]

 

Best city I've got is 12.9 and that's when I wasn't driving like I'm racing all the time. The best highway I got is 15.6 @ 75mph.

------------------
1997 XLT Teal 4.6L Flareside 4x4 ORP. Automatic, Reg. cab, 3.55LS, tinted windows, bug deflector, Dual exhaust, K&N Generation 2 air filter, BullDog keyless entry/remote start, Modern 16" wheels, bedliner, Covercraft tonneau cover, White faced gauges, electronic shift on the fly, Clarion ADX5655z Double Din Cassette & CD, 4 Pioneer TS-A6865 speakers and superchip.

Future mods: Supercharger, headers, NOS, tranny upgrade(heavy duty gears, clutch packs, etc.), performance torque converter, composite driveshaft, bore cylinders 30 over, new pistons, crank, and rods, get performance heads or port the ones I have, gauges for the a-pillar, new L if they still make them and I like the way it looks, and a Z06 Vette or BMW Z3.




Click here to see more pictures

 

The best mileage I've had is 21 mpg and worst about 14 mpg (19' boat and 6 people in the truck). This is on an imperial gallon though (Canada). Imperial is 4.55 litres and American is 3.78 Litres so that's about 17.5 mpg HWY and 11.6 worst.

To get high mileage you have to keep your foot light and smooth, stick to the speed limit, and keep your shifts smooth and below 2000-2500rpm.

I generally get around 14 mpg (US gallon)average and drive fairly aggresively. This is about 75% hwy driving.

Only mods I have is K&N filter, Mobil1 Synthetic 5w30. Stock 4.6 auto, 3.55 rear, 4x4, S/Cab, 17" factory rims and tires.

Remember people... these are big trucks and it takes gas to move'em. Sure, a Tundra may get better gas mileage but it has 25% less fat.

I had great fun in my old Toyota 4x4 but if I put just one load of dirt in the back the springs were on the bump stops.