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dex
Dodge Dakota
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9/19/2004
22:42:27
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 Subject: 3.9l MPG Highway avg 20.5
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I think I have what must be the heavest (see below) 3.9L Dakota and get a steady 20.5 mpg on the highway - 65-70mph no a/c.. I don't drive it in city traffic here in Georgia.
I think the answer is that I use a 40 psi tire pressure in all tires. The mileage is lower when I go faster. I get this mileage when I don't use a/c. I don't track the times when I use the a/c.
So here is the question. I seem to get better mileage the hotter the air tempeture. Why is that? Could it be the HD cooling I have?
2000 Quad Cab, 4X4, skid plates, automatic, a/c, towing package, HD cooling package, transmission cooling, tanaou cover, alumium tool box, front tow hitch, K&N filter package, spray in bed liner; 31 x 10.5 tires; current mileage 37K
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dex
Dodge Dakota
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9/19/2004
22:45:14
| RE: 3.9l MPG Highway avg 20.5
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To clairfy - on hot days 85+ degrees I have got 24.5 mpg driving at 65 - 70 mph without a/c.
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Dan M
Dodge Dakota
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9/19/2004
22:59:24
| RE: 3.9l MPG Highway avg 20.5
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I have a '95 dakota CC 3.9 auto 4x4 . I used to get 22-26 mpg on the highways with A/C - depending no how fast I drove (this was back in indiana). I haven't driven highway speends only for some years now. I do drive some city traffic here in the Atlanta area - only 15-20 minutes, max speed of 45mph, a few stop lights but not bumper-to-bumper traffic. I was getting ~13MPG. I just put in new plugs, wires and 0xygen sensor, I'll let you know what i'm getting in the city, from that i can make a good guess what highway would be.
The only non stock options I have are tonneau cover and autolight plugs and wires. I don't know what the weight difference is between our trucks, but yours should get slightly better MPG because of age. Oh yeah, I'm around 144k miles now (was 40k when i got the truck and put the tonneau on). The tonneau cover did add ~3-6 mpg depending on driving speed for me.
I would expect to see better milage at lower speeds and with no A/C. I'm not sure about the tire pressure or HD cooling - I would be interested in know the answer to that.
- Dan M
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eric
Dodge Dakota
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9/21/2004
16:43:40
| RE: 3.9l MPG Highway avg 20.5
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i have a 93 3.9 2wd 5 speed with 200,000 miles on it and get around 15 to 16 no matter how i drive or in city or highway. I have a fiberglass toneau cover also. i replaced plugs, wires, fuel filter, rotor cap, and put in a hotter msd coil. Don't know whats wrong with me if ur getting in the 20s with a 4X4.
eric
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mhall02
Dodge Dakota
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9/21/2004
17:16:57
| RE: 3.9l MPG Highway avg 20.5
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I have a '91 2 wheel drive w/ a 5-speed, best it has ever gotten is 21 strictly highway driving, usually 15-16 running around town. Overall average is around 16-17 mpg mixed driving. I had a '78 Ford F-100 that had a carbed 300 inline six three speed manual that got about the same in town, but driving that 3 speed on the interstate it would get only 17 (not 20 or 21). Slow that truck down to 55-60 on long trips it would get 20 or 21 mpg however. That truck did not have AC or a 5-speed so I don't miss that part but it does seem like the 3.9 (239 c.i.)should get better gas milage than a 4.9 (300 c.i.) in town and should be able to see 22-23 mpg highway w/ a 5-speed.
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moparman
Dodge Dakota
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9/21/2004
20:43:21
| RE: 3.9l MPG Highway avg 20.5
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I have a 95 4x4,Ext cab,3.9 auto. with 117,000 miles. I don't do any better than 16mpg. City or HIghway. Thought I would get alot better than that. My 90 1/2 ton 2wd 360, got 11 to 13 mpg.
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Bob Lincoln
Dodge Dakota
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9/21/2004
21:44:06
| RE: 3.9l MPG Highway avg 20.5
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I have a 92 4x4, club cab with cap, 3.9 auto. with 131,000 miles. I get 20 mpg highway, 17 around town. Maybe your 'highway' speed is over 65 mph. Gas mileage drops off rapidly as you go faster. Try a lighter foot.
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Just Looking
Dodge Dakota
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9/22/2004
02:07:32
| RE: 3.9l MPG Highway avg 20.5
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The hotter air aids in fuel vaporization
as we all know vapor is the most atomized form of a liquid so its more efficiently burned
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Verde AR Dog
Dodge Dakota
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9/23/2004
12:54:57
|  RE: 3.9l MPG Highway avg 20.5
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My 94 v6 4x4 with 178k miles gets about 18-20 hwy mpg. It was 21 when new. the only "mod" is a k&n filter in the stock housing I've used synthetic oil from the time it was new. I run 30x9.50 Coopers at anywhere from 30 to 50 psi depending on how and where I'm driving.
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vern
Dodge Dakota
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9/23/2004
19:40:23
| RE: 3.9l MPG Highway avg 20.5
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my 89 4x4,3.92 gears,auto o/d,235x15 tires,toneau cover,weighs 4460lbs,has snow plow head gear on front,jacobs ignition,ported tb,removed cat,vortex muffler duel outlet,14-16 mpg @ 55-65mph,
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avoska4
Dodge Dakota
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3/24/2013
16:52:04
| fqRHbcDeNwVHWlwIkL
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Õîòèòå êóïèòü ìîäíûé òåëåôîí èëè ïëàíøåò,ïî î÷åíü ìèíèìàëüíûì öåíàì â Êèåâå,ïîñåòèòå ìàãàçèí ÀÂÎÑÜÊÀ.Áîëüøîé âûáîð ìîáèëüíûõ òåëåôîíîâ,ñìàðôîíû,ìîäíûå àêñåññóàðû è ãàäæåòû ê ìîáèëüíûì òåëåôîíàì, íîóòáóêàì, êîìïüþòåðàì,êóïèòü è çàêàçàòü ìîæíî â ìàãàçèíå ÀÂÎÑÜÊÀ.
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