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MikeW
Dodge Dakota
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3/27/2002
17:04:10
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 Subject: Why did 2002 fuel economy go up 2 mpg?
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Anyone know what was changed in the 2002 model year that caused the V6 city mpg to increase from 16 to 18 mpg? Below is the official MPG listing for 2002 and 2001.
Dakota 3.9 with auto
2002 -
MPG (city) 18 MPG (comb)18 MPG (hwy) 19
2001 -
MPG (city) 16 MPG (comb) 17 MPG (hwy) 20
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Todd W
Dodge Dakota
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3/27/2002
18:27:47
|  RE: Why did 2002 fuel economy go up 2 mpg?
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Could be a bunch of things. Maybe some more tweaking of fuel mixtures and timing, slight differences in exhausts, or maybe different gear ratios in the tranny?
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MikeW
Dodge Dakota
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3/27/2002
19:18:16
| RE: Why did 2002 fuel economy go up 2 mpg?
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The only difference I could find was the Axle Ratio - changed from 3.55 to 3.21. I wouldn't have expected this difference would add 2 mpg to city and decrease hwy by 1 mpg. Must be something else.
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Todd W
Dodge Dakota
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3/27/2002
20:23:25
| RE: Why did 2002 fuel economy go up 2 mpg?
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Yeah, that'd do it actually... Engine RPMS are actually lower at speed, which usually equals less throttle at speed.
Of course, highway speed usually involves having to get on it, and the higher ratio makes the engine work harder. My guess would be that an identical 2002 to my 2000 3.9L 5-speed 3.55 would be slower in the 1/4 and 0-60.
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