Gas milege
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Joined: Nov 2005
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From: Cottage Grove, Minnesota
Something isn't right for your 4.6. I have a 97 F150 4.6 auto Scab 4x4 3.55 and get 15-16 mixed driving and I just got back today from a trip to southern MN. I put 225 miles on the truck and used only 1/2 a tank from the day I left to when I got back. On the highway I'll get between 18-21, depending on my speed. I have 204,200 on the truck.
On the way down I did 65 the whole time and on the way back it varied from 60-75 following the same route.
On the way down I did 65 the whole time and on the way back it varied from 60-75 following the same route.
New User
Joined: Aug 2003
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2003 fx4 scab.....5.4, 3:55 gears....k&n filter, 3" gibson cat back exhaust, superchip tuner ........15-16 everyday driving......18-19 highway......also run 5-20 semisynthetic motor if that helps.......and i keep tires inflated to the max sidewall pressure minus 2 lbs.....truck has 77k and mileage is very consistant except when below 20 degrees or in 4 wheel drive in the snow....
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Joined: Jul 2007
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A number of questions, thanks for your input......
How can I check out which gears that I have?
Which ones are better/ worse for gas mileage?
Is it possible and "healthy" for the vehicle to change the gears?
If it is, how can it be done?
Which ones are better/ worse for gas mileage?
Is it possible and "healthy" for the vehicle to change the gears?
If it is, how can it be done?
Originally Posted by ajbeiler
ok first things first. do you know what gears you have in the truck 3.55 4.10 3.73? ok does the truck have a stock muffler on it. ok my 4.6l get 17-18 around town and 18-20 on interstate. at 155,000 ,miles i was getting like 14-15. i change all my plugs and wires and put a sheild on the wires. use autolight plugs. i changed the pcv and all the fuilds in my drive tran. use syn oil. i saw a big differance when i did this. also check for drag in your wheel bearings and drive line you might need an alinement to. ps i get that milage running 15w-40 rotella-t so that really go being thats why the 5w-30 is here to so say get you better gas milage. haha i don't like five weights. 10s are ok in my book.run some lucas injecter cleaner in it this to will help and not hurtt the injecters alot of other will so watch what you use. good luck
New User
Joined: Jul 2007
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F150 Mileage
I just changed the plugs and the wires, transmission fluid and oil & filter. I took a trip to the cabin (about 130 miles each way) and averaged 16 mpg about half highway/ half country roads, a lot of hills in the country.
How can you identify the gear ratio in the differential (yours is 3.55)?
Is a higher or lower gear ratio better for gas mileage? ajbieler (below, 7/21/07 @ 12:25 )says that 3 are available (3.55, 4.10, 3.73). My gut instinct tells me that a higher gear ratio should be better for gas mileage (i.e. rear wheels turn 3.55 times for each 1 engine revolution????)
Thanks for the input!
How can you identify the gear ratio in the differential (yours is 3.55)?
Is a higher or lower gear ratio better for gas mileage? ajbieler (below, 7/21/07 @ 12:25 )says that 3 are available (3.55, 4.10, 3.73). My gut instinct tells me that a higher gear ratio should be better for gas mileage (i.e. rear wheels turn 3.55 times for each 1 engine revolution????)
Thanks for the input!
Originally Posted by skilife17
Something isn't right for your 4.6. I have a 97 F150 4.6 auto Scab 4x4 3.55 and get 15-16 mixed driving and I just got back today from a trip to southern MN. I put 225 miles on the truck and used only 1/2 a tank from the day I left to when I got back. On the highway I'll get between 18-21, depending on my speed. I have 204,200 on the truck.
On the way down I did 65 the whole time and on the way back it varied from 60-75 following the same route.
On the way down I did 65 the whole time and on the way back it varied from 60-75 following the same route.
Elder User
Joined: Nov 2005
Posts: 788
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From: Cottage Grove, Minnesota
Originally Posted by John Bianco
I just changed the plugs and the wires, transmission fluid and oil & filter. I took a trip to the cabin (about 130 miles each way) and averaged 16 mpg about half highway/ half country roads, a lot of hills in the country.
How can you identify the gear ratio in the differential (yours is 3.55)?
How can you identify the gear ratio in the differential (yours is 3.55)?
Originally Posted by John Bianco
Is a higher or lower gear ratio better for gas mileage? ajbieler (below, 7/21/07 @ 12:25 )says that 3 are available (3.55, 4.10, 3.73). My gut instinct tells me that a higher gear ratio should be better for gas mileage (i.e. rear wheels turn 3.55 times for each 1 engine revolution????)
Thanks for the input!
Thanks for the input!
Last edited by skilife17; Jul 24, 2007 at 10:25 AM.
New User
Joined: Jul 2007
Posts: 6
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Under "AXLE" on the driver's door tag is "19". The next letters are "TR" and under that is "U". The rest of the letters on top/ bottom are "SPR/AN" and "9VNAA/E" The entire sequence looks like this:
W8/139 BMC/C "INT TR"/M2 R/9 AXLE/19 TR/U SPR/AN 9VNAA/E
Thanks for the input!! Let me know if I can relay any other info.
W8/139 BMC/C "INT TR"/M2 R/9 AXLE/19 TR/U SPR/AN 9VNAA/E
Thanks for the input!! Let me know if I can relay any other info.
Originally Posted by skilife17
Take a look on the drivers door jam and look under axle it will either have a number or a number and letter ie: 19, H9. Post it here and we can identify what gears you have.
Lower gears will give you better city milage and maybe .5-1mpg less on the highway. Lower gears are actually better because the motor doesn't have to work as hard to get the truck moving.
Lower gears will give you better city milage and maybe .5-1mpg less on the highway. Lower gears are actually better because the motor doesn't have to work as hard to get the truck moving.
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Joined: Jun 2005
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From: Jackson,Tn
Originally Posted by John Bianco
I also have a '99 F150 with a 4.6 L engine. I'm lucky if I get 10 mpg in the city and +/- 14 mpg on the highway.
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From: Iowa
Originally Posted by bigun72
man this sucks , i just bought me a 99 with a 4.6 ...
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Senior User
Joined: Mar 2005
Posts: 393
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From: Mi
yeah something is up with yours....my 02 5.4 fx4 with 50k on it this past weekend i used a whole tank and got 15.2 with a hi-way trip included and then to work and back the rest of the tank and i was driving like i stole it on the hiway up north doing about 90 the whole way and back.....only way to make that trip in a day....so im happy with 15mpg....by the way on this trip a nissan wanted to try and play hardball but didnt have the guts to do 90+.....
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From: Louisville, Kentucky
Originally Posted by John Bianco
Under "AXLE" on the driver's door tag is "19". The next letters are "TR" and under that is "U". The rest of the letters on top/ bottom are "SPR/AN" and "9VNAA/E" The entire sequence looks like this:
W8/139 BMC/C "INT TR"/M2 R/9 AXLE/19 TR/U SPR/AN 9VNAA/E
Thanks for the input!! Let me know if I can relay any other info.
W8/139 BMC/C "INT TR"/M2 R/9 AXLE/19 TR/U SPR/AN 9VNAA/E
Thanks for the input!! Let me know if I can relay any other info.
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Joined: Nov 2005
Posts: 16
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From: Lexington NC,HighrockLake
my milage was bad ,truck ran fine,but weak.I checked my tps,it checked bad under acceleration.replaced tps ,now I get 17cty 22hwy more power. 1997 4.6 3.55gears 4r70w trans 4wd 85000 miles sc. pulls my 3000lb boat a lot better at 14-15 mpg.old mpg -11with boat,14cty,17 hwy,at best,sometimes worse.I hope everyone with these trucks will check their tps,seems to me to be a lot of peoples problem after replacing a lot of parts and spent $. tps fomoco-60.00$-advance-30.00$ HOPE this helps.
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