| From | Message |
shatto
Dodge Dakota
JOIN HERE
5/11/2006
01:10:21
|
 Subject: V6 MPG
IP: Logged
Message:
The truck:
98 3.9, auto, std cab, long bed. Gibson headers, Amsoil air filter, Amsoil by-pass filters, 0-30 oil.
The Mileage:
500,000 on same engine and transmission.
All gas represents a fill up. The date usually is for the day prior.
Payload includes fat driver (210lb)
Highway speed is 65MPH on cruise with A/C
Date...Gallons....Miles Driven...Payload...MPG
5/10...7.236......170............870lb.....23.5
5/10...6.482......112............210lb.....17.3
5/09...13.104.....249............1145lb....19
5/08...11.080.....235............470lb.....21.2
5/08...15.221.....294............265lb.....19.3
5/05...12.439.....243............350lb.....19.5
5/04...18.796.....365............275lb.....19.4
5/02...9.870......193............210lb.....19.6
5/02...23.358.....420.(2 tanks)..244lb.....18.0
4/28...10.257.....193............250lb.....18.8
$404.27.
Guess the 98 3.9 gets around 19 MPG.
|
Relf
Dodge Dakota
JOIN HERE
5/11/2006
01:35:06
|  RE: V6 MPG
IP: Logged
Message:
Dang, you're getting mileage like that out of a 500,000 mile engine and tranny AND with a payload? My engine/tranny has 210,000 and my mileage is around 14 MPG, with a leer shell hauling NO payload but my fat a$$. I just bored out a 42mm TB to a 46mm.
What size throttle body are you runnin'?
Relf.
|
shatto
Dodge Dakota
JOIN HERE
5/11/2006
01:51:21
| RE: V6 MPG
IP: Logged
Message:
Throttle body is stock. Pluge are el-cheapo Autolites set at .53 for the Jacobs which isn't hooked up.
I have Michelin tires, which give better traction, life and MPG than the Bridgestones or Goodyears.
|
J and J Auto
GenII
5/11/2006
02:18:13
| RE: V6 MPG
IP: Logged
Message:
My 1995 short box reg cab 4X4 completly stock
splitfire plugs on the way back from a weding
in milwaukee 15,000 miles on the truck hit 25.8
80 degrees out cruse at 60 with A/C on but has
never done that again
It averaged 17 to 19mpg all the time
now with all the bolt on's port matched and head
ports just polisished and a stage 2 chip 22 24mpg
weired hey 114'000 on motor
getting only 14mpg there is something not right
there or you have a lead foot
Larry
J&J Auto
|
J and J Auto
GenII
5/11/2006
02:25:12
| RE: V6 MPG
IP: Logged
Message:
I have to add this also
Just bought the truck 200 miles on it drove to
milwaukee cruse at 60 got 14.5 15.5 on the way
back with 450 miles on the truck and it remaind
at 15 16 untill it had 8,000 miles on it than it
went to 17 19mpg
there were no aftermarket parts back in dec 94
when I bought the truck
Larry
J&J Auto
|
MadMason
Dodge Dakota
JOIN HERE
5/11/2006
05:29:25
| RE: V6 MPG
IP: Logged
Message:
19 mpg?
my 98 V6 auto gets around 14-15 when she is running good. with nothing in it but me.
its a dakota sport with a dynomax dual exhaust (not true, just the muffler) and tonaue cover
|
Bob Lincoln
Dodge Dakota
JOIN HERE
5/11/2006
08:16:08
| RE: V6 MPG
IP: Logged
Message:
Don't know what you guys are doing wrong - maybe leadfeet. I have a 92 Dak club cab with V-6, 4-spd auto, 3.55 axle, 4WD and aluminum cap, and 150K miles on engine. I average 19 mpg, but get 20-22 on the highway. Drove from MA to FL and back last winter with wife and baby, bed loaded to the very top of cap, averaged 20 mpg for the trip. Truck is ALL stock.
|
N56629
Dodge Dakota
JOIN HERE
5/11/2006
10:46:37
| RE: V6 MPG
IP: Logged
Message:
V6 MPG sucks. I get 17-18+ except during the winter and I'm not easy on the gas. I drive a combination of freeway and county roads in the morning and rush hour traffic in the evening.
99 CC 5.2 Auto 3.55 LS
WingsWest Body Kit *2/4 Western Chassis Drop
Edelbrock Pro-Flo Air Cleaner*Edelbrock Valve Covers
MSD 6A Ignition and coil
SuperChips
Modified TB & Intake Manifold
JBA Cat Back *JBA Y-Pipe *JBA Headers
Comp Hi-Tech Stainless 1.7 Roller Rockers
|
bludak
Dodge Dakota
JOIN HERE
5/11/2006
10:58:29
| RE: V6 MPG
IP: Logged
Message:
N56629, I see you are running the superchips programmer. I have just ordered one and would like to know your thoughts on it for performance and towing. Which setting works best and was it worth the money paid.
|
N56629
Dodge Dakota
JOIN HERE
5/11/2006
19:00:41
| RE: V6 MPG
IP: Logged
Message:
FWIW and believe it or not I just got 17.8mpg. I decided to see what I would get if I was intentionally hard on the gas. I've tried taking it easy many times and kept getting disappointing results. On this last tank I couldn't have driven any more aggressively without begging for a ticket. Highway speeds were generally 10-20 mph over the speed limit and many times I accelerated at wot.
I'm not suggesting that anyone drive like that only that taking it easy has been disappointing from a gas conserving point for me.
bludak, I'm anything but disappointed in my SC. I especially like the change in the shift pattern. The torque convertor doesn't lock up until after it goes into OD. Lock up is about 52 mph and the shift point moves up to 5200 rpm at wot. I haven't tried the tow program and have only used the 92 octane program a couple of times. I just don't need it for daily driving. If I think that I'm going to do a little cruising on the weekend I plan accordingly and keep the tank near empty. My guess is that towing program advances the timing at lower rpm's. As some people have suggested, that may be good for drag racing, but I don't know what that would do for your top end. If that was really better, what would you need a "Performance Program" for?
|
Relf
Dodge Dakota
JOIN HERE
5/11/2006
21:12:58
|  RE: V6 MPG
IP: Logged
Message:
Larry and Bob, I am pretty conservative when it comes to driving. I'm not a leadfoot, but I'm not an old lady, either. Here's my mods:
Drop-in K&N
Machined 46mm TB
TPS set @ .7 volts
Machined intake man. 1/2" off runners,
gasket matched, opened up inj. bosses.
1/4" plenum plate
Carsound cat. conv.
new O2 sensors (last summer)
Gibson side swept cat back exhaust
Autolite 3924s
Mobil 1 10W-30
Mopar wires
Brass cap & rotor
CPS mod. (did it yesterday)
Injector sync. +2 maybe.
All this on a 1998 Dakota sport 4X4 Club Cab automatic. Toyo 30 X 9.50 R15 tires. Leer camper shell. Not sure about the gears.
Thanks
Relf
|
bludak
Dodge Dakota
JOIN HERE
5/12/2006
09:56:01
| RE: V6 MPG
IP: Logged
Message:
Well, I just installed my Superchips program and the 87 octane setting really doesn't change anything so on to the perf/towing setting. I had a little over 1/2 tank of regular 87 octane fuel in it so I went to the local airport and filled a 25 liter can with 100 octane av gas and poured it in. That pretty much topped it up. I installed the perf/towing program and there is a great increase in low end torque and it stays right up there throughout the rpm range. Also I was able to pass with ease with a very strong headwind as I went home last night. I was never able to get the truck over 100 mph but it attained 110 plus there was more left in it. It still shifted at around 5000 rpm but there is still a little adjustment left on the TV cable and I am not sure if increasing that adjustment will change the shift point. No pinging at all!! I also have the Crank sensor mod which may have added a couple degrees of timing also to begin with. I am real happy with the setting that I have it at right now and will try the Performance setting after I empty this tank of fuel and put in straight 91 octane so there is no guessing about the octane rating with the av gas. I also was able to get the speedo to read correctly with the bigger 275/60/15 tire on the rear. All in all, I am glad I spent the cash on this, it really compliments the 1.7 Harland sharps, 46 mm Fastman TB, ported intake and relocated IAT.
|
N56629
Dodge Dakota
JOIN HERE
5/12/2006
10:48:53
| RE: V6 MPG
IP: Logged
Message:
It doesn't sound like you gave the 87 much of a chance. True you don't get a big kick in the pants but for daily driving it is hard to beat. If you don't mind running premium fuel 24/7/365 then by all means run performance/tow programs.
I too have left in the CPS mod and have occasionally dumped in a couple of gallons of avgas on hot summer days when I was getting a bit of pinging.
|
zzark
*GenII*
5/12/2006
11:41:47
| RE: V6 MPG
IP: Logged
Message:
I used to get a good 20 mpg,
until I did all the mods to increase gas mileage,
now I get 18-19 mpg.
zzark
|
josh
Dodge Dakota
JOIN HERE
5/17/2006
11:13:49
| RE: V6 MPG
IP: Logged
Message:
What are you guys doin? I got a 50 mile commute, uphill both ways, in tornadic headwinds and 10 feet of snow, and I get 28 MPG at WOT and 80 MPH...
Seriously, tho, remind me to never buy a truck with an automatic. I have a '94, 3.92 gears, 5-speed stick, 145k on the clock, new fuel pump, and I always get a consistent 21 mpg. (This is driving 110 miles per day, where 30 mi is highway at ~75 mph, 30 mi is city at ~35 mph, and 50 mi is 60 mph... measured on the same gas pump at the same gas station every time...)
|
cuzindoug
GenIII
5/17/2006
11:40:55
| RE: V6 MPG
IP: Logged
Message:
Before my mods, I was getting 14-15 City and 18-19 Hwy. Now I get between 19-20 City and 24-26 Hwy.
I only got the following ONCE, and never have been able to attain it again : 29.752 MPG!!! It was a 500+ miles stretch of I-95 with no hills at about 70 MPH.
If it doesn't fit, you're using the wrong hammer!
|
Dan M
Dodge Dakota
JOIN HERE
5/17/2006
13:23:02
| RE: V6 MPG
IP: Logged
Message:
I used to get 17-18 combined on my old 95 CC 4x4 3.9L auto 3.55 with tonneau. I used mobil 1 synthetic oil, ATF +3 or ATF+4 transmissions fluid, 10" edelbrock air hat with K&N Filter, autolight plugs and wires. On highway I got up to 25 MPG depending on speed. Traded it in with 167k miles. Original motor and transmission. All other parts were stock.
- Dan M
|
bludak
Dodge Dakota
JOIN HERE
5/17/2006
15:43:59
| RE: V6 MPG
IP: Logged
Message:
My gas milage is going down with all the mods I have done, but thats my fault, I can't seem to keep my foot out of it!! Finally some power. Wish I could find some decent priced headers, they want way too much for what you get.
|
wadak
GenIII
5/19/2006
20:06:19
| RE: V6 MPG
IP: Logged
Message:
Last tank average of city and freeway driving 19mpg. Last freeway only mileage 24 mpg.
92 and 97 Daks both with many mods.
|
J and J Auto
GenII
5/20/2006
23:59:28
| RE: V6 MPG
IP: Logged
Message:
Do some experimenting
try a set of 3923 or NGK FR5 plugs
gap between .035 .045 stock ign
obd1 calls for .035
obd2 calls for .040
in order to get good mileage all sensors must
also work right just one lazy or bad sensor can
kill gas mileage
sometimes just changing 1 thing can change mileage
drasticly
I just changed the exhaust system and a sticky
caliper replaced both kept changing one time 19
next time 22 23 wonder how it will be now
syn fluids also help a lot all fluids rears trans
transfer case engine oil
draging breakes kill mileage check those
vac leak restricted intake or exh kills mileage
bad wheel bearings
so many things that can make or break mileage and
it only takes one of them to bite ya
Larry
J&J Auto
|
Relf
Dodge Dakota
JOIN HERE
5/21/2006
11:51:42
| RE: V6 MPG
IP: Logged
Message:
Larry, I have checked the sensors you have outlined before on another post:
TPS
MAP
IAT
IAC
O2
All are within tolerances listed in the Haynes Manual.
I will check out the wheel bearings and the sticky brake calipers this week.
I just can't figure out why my engine runs so good but gets crappy mileage. thanks.
Drop-in K&N
Machined 46mm TB
TPS set @ .7 volts
Machined intake man. 1/2" off runners,
gasket matched, opened up inj. bosses.
1/4" plenum plate
Carsound cat. conv.
new O2 sensors (last summer)
Gibson side swept cat back exhaust
NGK V-power FR5 plugs
Mobil 1 10W-30
Mopar wires
Brass cap & rotor
CPS mod.
All this on a 1998 Dakota sport 4X4 Club Cab automatic. Toyo 30 X 9.50 R15 tires. Leer camper shell. 3.92 gears. 213,000 miles.
Thanks
Relf
|
| | P 1 Next Page>> |
