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  #11  
Old 10-05-2013, 12:13 AM
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I think highway should be about the same, city may show some improvement though. I think 17 or 20 inch wheels and tires would show a bigger difference.
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  #12  
Old 10-08-2013, 05:16 PM
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They do have the same ratio in top gear however the 8 speed is more efficient so there is mileage gained there. Also most of your MPG loss is in getting up to speed and passing where the 8 speed is advantageous as well. If I'm not mistaken I don't think the 6 speed trucks have the grille shutters either.
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  #13  
Old 12-15-2013, 05:44 PM
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6-speed vs. 8-speed, from the 2013 EPA *raw*, unadjusted test data:

Ram 1500 Hemi, 5500 ETW, 4WD:
Truck L9DS10852 6-spd, 3.55 FDR, 25.3 N/V. MPG Highway 25.6 City 16.5
Truck R3DS19935 8-spd, 3.21 FDR, 22.8 N/V. MPG Highway 28.6, 28.4 City 17.6, 18.4, 18.5

and the 2WD Ram 1500 Hemi, 5500 ETW,:
Truck L9DS10852 6-spd, 3.55 FDR, 26.0 N/V. MPG Highway 27.1 City 17.0
Truck L3DS19531 8-spd, 3.21 FDR, 22.8 N/V. MPG Highway 29.6, 30.1 City 18.5

ETW is Emissions Test Weight;
N/V is the tire "rev's per mile" and can be used to back-figger out which tire was on the test vehicle.
pretty sure none of these is with the base 17" (N/V 23.6)

it seems odd that the same vehicle was used for both 6-spd 2WD & 4WD tests,
but different tires ? may be a typo, may be real ..

before you freak out about how high these MPG results are, read
http://en.wikipedia.org/wiki/FTP-75
to understand more about the EPA testing and cycles

search for 'EPA test car data' if you wish to download the actual Excel files;
not much there for the 2013 1500 hemi's..
there's more V6 stuff, not surprisingly.
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  #14  
Old 12-15-2013, 06:55 PM
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5.7L Hemi 8speed... Until the deep freeze and after 2000km on the odo, I was at 14.5... But the last three days the temp has been -10c or lower, and my L/100km has gone up for to 16.5.

This is predominantly at a 36km/h speed, according to EVIC.
I'll be doing a 300km highway trip the end of next week and we'll see what kind of mileage I get.
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Old 12-16-2013, 04:56 PM
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2013 5.7 8-spd HFE R/C shortbed tonneau cover 2WD 3.21 17" tire 1300 miles on odo

my first & only trip in the truck:
just over 200 miles, on the way back from the dealership,
4-8 degrees F, 2-lane roads, cruise on 63 most of the way...

22.1 mpg according to EVIC

tire pressure according to TPMS all 37-8 so each is couple psi low.

I drove *very* conservatively
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