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New 3.7 Owner, Need better Gas Mileage

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  #1  
Old 08-14-2008, 06:27 PM
ghammond ghammond is offline
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Default New 3.7 Owner, Need better Gas Mileage

I just bought a used 03 standard cab 1500 with an automatic transmission, a SNUGtop tonneau cover, and 95,000 miles. Unfortunately I didn't know about this forum until now. I bought a V6 for better gas mileage, but 14.7mpg isn't my idea of good gas mileage.

I was hopping for 18mpg or at least 16. The 1994 explorer with 210,00miles and 4.0liter V6 it replaced was getting 16mpg at least!

My question to you is, is there possibly a problem that needs to be fixed? I drive 10 miles to work 90% highway. I try to accelerate in the 2500 rpm range and set cruise control around 60. I keep a light foot. Should I do some maintenance for this mileage range or put in a certain type of spark plug? I've read through a lot of the threads here, but it looks like most people are looking for more power. I don't need more power, in fact I would sacrifice some fore more mpg.

I read that the power wire can give 1 to 2 mpg better which would help.

Any tips are appreciated.
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  #2  
Old 08-14-2008, 07:13 PM
Redbud66 Redbud66 is offline
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power wires are not well liked by the people who I have heard of that use them, I doubt it would do much.
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  #3  
Old 08-14-2008, 11:03 PM
7mmmag1 7mmmag1 is offline
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a tune up wouldnt hurt with that many miles. check the air filter and replace it if its too dirty, a good set of ngk plugs, and non ethanol gas should help out quite a bit. also using the cruise control actually hurts your fuel mileage if you drive on hills, even small ones. make sure you set the tire pressure evenly, I like to keep about 35 pounds in mine, and avoiding traffic are the easy ones. If that still isnt good enough, and you want to add mods, a muffler or cat back will add about .5 mpg

hope this helps
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Old 08-15-2008, 01:31 PM
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yea, just a tune-up would do a bit. it would get the truck running to at least what it should be. powerwire...i'm not to keen about. i mean, maybe if you drive very lightfooted, like u said u do, maybe you'll get better gas mileage...but it my case, it eats away at gas mileage...

and like mag said, maybe a free flowing muffler would help, but again, i mean u spend $300 on an exhaust to HOPEFULLY get .5mpg more...it seems like it would take too long to pay for itself at .5mpg.

also, try different gases. our trucks are supposed to run on 87 the book says, but try 89, see if it's worth the price increase for the mileage increase. throw some of that fuel system treatment in your next fill up to. in my maxima, i throw one in every tank along with 91+ octane...(it gets filled like once a month...cause i never drive it in summer). and that $3 bottle of gas treatment adds 60miles to the tank. at 17mpg, that's like just about $15 in fuel savings in a $3 investment.

what kind of wheels do u have? the 17's, or do u have some heavy ole' twenties? centerline has wheels are that lighter than hell...that'll save on gas.
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Old 08-15-2008, 10:12 PM
7mmmag1 7mmmag1 is offline
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id just go with the 100 dollar exhaust. get a goerlich muffler if your muffler shop carries em, if not, id just go with a 3in 3out single exhaust flowmaster, I prefer the 40, but get what you want, cause you're the one who gets to listen to it, and its probably going to be there awhile. (The 70 rumbles, but hardly sounds louder than stock). Also, single exhaust systems are a lot cheaper to have installed (mine was 45 bucks to have installed, and the goerlich muffler is about 50-60 bucks, so I got outta the shop for under a hundred bucks) The Goerlich is made on the same machine as a Flowmaster, but gets skipped on the name stamping machine (my dad is a dealer)

Good Luck!
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Old 08-16-2008, 11:55 AM
ghammond ghammond is offline
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Thanks for your replies. I've heard that there really isn't a "tune up" for cars made in the last 20 years because the computer is constantly tuning things up. What things would go into a modern tune up?

I'll definitely try some different octanes. My brother-in-law said there's a little gas station by his work that has 100 octane. Would that be a bad idea? I'm going to try pouring 1/2 a bottle of Seafoam down the brake booster vacuum line and see if that helps.

The rimes are on the truck are stock. I'll have to check on the size. The air filter looks new.

Thanks for the tip on the goerlich!
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Old 08-16-2008, 01:21 PM
Redbud66 Redbud66 is offline
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I don't think that 100 octane gas, if it gives you any gains at all, will be worth the price that you pay for it. Just go with 89 or 91 and see what happens with that.
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Old 08-17-2008, 12:58 AM
7mmmag1 7mmmag1 is offline
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if you do go with the 100 octane, make sure its not av gas, or any kind of leaded fuel
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Old 08-18-2008, 10:06 AM
7mmmag1 7mmmag1 is offline
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i usually use 87, but I havent been driving much this summer, and I guess the fuel in my tank degraded, because it was pinging, and I had to put some 91 in there to freshen it up. Once college starts (tomorrow) I will be driving a lot more and shouldnt have this problem.
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Old 08-18-2008, 11:30 AM
ghammond ghammond is offline
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If a higher octane won't do anything for mpg's or power, will it help clean the engine at all? I have to get gas today so my plan is to get 89 and a full additive.
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Old 08-18-2008, 04:22 PM
ghammond ghammond is offline
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Just filled up again. 14.5mpg on this tank but I didn't drive conservative and I towed a bit.

I used 89 octane and two bottles of STP super concentrated Fuel Injector cleaner (since 1 bottle treats 21 gallons). I'll see if it makes a difference.
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Old 08-18-2008, 05:47 PM
Redbud66 Redbud66 is offline
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since it is high mileage you might look into when the last rear end and tranny service were. If it has not been done in a while it definitly needs it and synthetic fluids would probably give you a slight increase in economy as well as be easier on your parts.
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Old 08-18-2008, 07:57 PM
7mmmag1 7mmmag1 is offline
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the higher octane burns easier, so it won't leave as much residue, it ignites faster and burns more thoroughly. btw dont worry about the octane booster if your engine isnt pinging, and the "mileage booster" is just snake oil in a gas engine
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Old 08-19-2008, 12:13 AM
Redbud66 Redbud66 is offline
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the higher the octane the more resistant it is to combustion due to compression instead of the spark. In an engine like ours this is not a big deal since the motor was designed to allow for a certain amount of this without knocking whereas in a performance engine with higher compression and more aggressive fuel and timing curves this allowance for premature combustion is not allowed for so higher octane fuels must be used. The higher octane fuel will give you better combustion and put less stress on the motor like 7m said and better gas mileage could result, but if there is any gain it probably will not be noticible.
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Old 08-19-2008, 04:24 PM
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wich says what I just said. That is why most certified mechanics will recommend the use of higher octane gas on older vehicles.
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  #16  
Old 09-12-2008, 05:14 PM
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Ha Ha you got suckered in like rest of us thinking 3.7 would get better MPG.

Grin and take it like a man cry alot you not the only one who got stuck with a under powered not so good MPG truck I just waiting to pay my way down or off before I get rid of this truck Like the Truck but MPG sucks and having no power on top of it makes this a truck which I not planning to keep.

Oh yea don't waste you money on extras trying to improve it been down that road not worth the money you going to spend and what you get out of the truck just drive it.

If you are going to spend money on the truck the Anti Sway bar is the best bang for the buck.
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Last edited by marv02; 09-12-2008 at 05:16 PM..
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  #17  
Old 09-12-2008, 09:27 PM
explorer9950 explorer9950 is offline
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I have had the same problem here lately, except mine is an 06' ram 1500 3.7L V-6. I used to be able to top off the tank, until I couldn't put any more gas in, and it would stay above the full line for at least 4 or 5 days without going down, now, I drive 2 days just to and from school, and it goes down. i am now putting 10 or so bucks in every other day to keep it full. ( I dont like to run the gas down to far) trucks only got a bit under 17,000 miles on it.
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Old 09-13-2008, 06:55 AM
HankL HankL is offline
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start reading at post number 28 here:

http://www.dodgeforum.com/forum/show...t=56153&page=3

it is a very long read.

notice that some of the mods not only improve MPG
but also improve torque
which will make driving your 3.7 'feel' better

in a nutshell
you want to educate yourself about 'HyperMiler' like driving
reduce your tire's rolling resistance
make your truck slip through the wind easier (aerodynamics)

the newbie mistake is to try to improve the engine first
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Old 09-13-2008, 06:55 AM
 
 
 
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