6.4 Sucks Fuel!!!!!! - Diesel Forum

mjstef · 05-13-2008, 10:33 PM

One of our contractors stopped in tonight to BS. He has an 08 550 Reg Cab 4x4 Automatic with 12,000 miles on it and while it has been problem free it averages 6.8 MPG mixed driving and 8.5 on the highway!!! It weighs right at 12,000# They have 3 other 6.4's getting similiar mileage while the old 7.3's in the fleet get almost double! My 99 Peterbuilt Dumptruck does 6.5 mpg in mixed driving with a 500HP Red Top Cummins in it at 54,000#!!! My 92 Shop Truck with a 460 GASSER does better than that pig at almost 12 in town and 14 highway!! Is there ANY help for mileage in these trucks????

meg69 · 05-14-2008, 08:05 AM

So far the only reliable way to get better mileage is to slow down and drive the thing like a 80 yr old lady. OR toss your warranty out the window and do a EGR/DPF/DOC delete and use a programmer to disable the regen cycle.

dsltek · 05-14-2008, 04:09 PM

had a customer come in a complain of fuel mileage. 08 f-450 drw crew cab 4x4. ummm lets see. huge trk.....towing.....low tire pressure......ummm oh forgot the 4.88 rear end oh and trying to stay at 75-80. ahhhh duh ur only getting 8-9mpg. these vehicle say right on the window sticker. THIS VEHICLE IS NOT RATED FOR FUEL ECONOMY.....which means u get whut u get! ie: drive slower buddy

OMCUSNR · 05-14-2008, 04:09 PM

Quote:

Originally Posted by meg69

So far the only reliable way to get better mileage is to slow down and drive the thing like a 80 yr old lady. OR toss your warranty out the window and do a EGR/DPF/DOC delete and use a programmer to disable the regen cycle.

Which is illegal.

Arkapigdiesel · 05-14-2008, 06:30 PM

Quote:

Originally Posted by OMCUSNR

Which is illegal.

Yeh, there's nothing like leaving everything stock and fighting to get 17 MPG on a good day.

OTOH, the diesel fuel robbing "devices" can fall off somewhere down the road, a programmer can be used to defeat codes, and I can get 19-21 MPG consistently when driving all interstate with the cruise set at 75. Sure, let me keep those "devices" on my truck along with the mandated active regen

Dick · 05-14-2008, 07:04 PM

Quote:

Originally Posted by Arkapigdiesel

Yeh, there's nothing like leaving everything stock and fighting to get 17 MPG on a good day.

OTOH, the diesel fuel robbing "devices" can fall off somewhere down the road, a programmer can be used to defeat codes, and I can get 19-21 MPG consistently when driving all interstate with the cruise set at 75. Sure, let me keep those "devices" on my truck along with the mandated active regen

all that emission stuff on the 2008's is exactly why I bought a 2007. I got 18.7mpg today at 70mph. That is pretty typical for me.

redtopman · 05-14-2008, 08:01 PM

Quote:

Originally Posted by OMCUSNR

Which is illegal.

Just upgraded my 97 by trading in for a 2002. Had to sign something certifing that I did not alter the emissions system including exhaust and electrical. Don't know what the penalties will be for getting caught.

mjm11 · 05-14-2008, 08:34 PM

I found the best way to solve the 6.4 MPG issue...a Toyota Yaris. I bought one for 12 grand and it gets 39 MPG. I guess the good ole days are gone forever to greed. The F450 will only see use on camping trips and to haul stuff. I don't regret trading the 2005 D-max in, it only got 16.5 with a banks six gun. I do regret that I could not see into the future and see that fuel would be so much I don't want my fifth wheel and sweet assss F450.
Mike

Power12 · 05-14-2008, 08:39 PM

I have a 2008 f-250 with an 8 in. lift and running 37's I set the SCT Extreme on 120 with elevation 2800 ft and I'm getting 12 mpg hand calculated. But I expect that from a pick-up. Everyone knows fords aren't known for gas mileage but they look dang good.

mjstef · 05-14-2008, 08:46 PM

Quote:

Originally Posted by dsltek

had a customer come in a complain of fuel mileage. 08 f-450 drw crew cab 4x4. ummm lets see. huge trk.....towing.....low tire pressure......ummm oh forgot the 4.88 rear end oh and trying to stay at 75-80. ahhhh duh ur only getting 8-9mpg. these vehicle say right on the window sticker. THIS VEHICLE IS NOT RATED FOR FUEL ECONOMY.....which means u get whut u get! ie: drive slower buddy

It's only a 6.4 thing as the old 7.3's in the fleet do 12 in town and 15 on the road.....................

Power12 · 05-14-2008, 08:58 PM

That's my husband 7.3 and it gets 17 with 90,000 miles on it and the ts performance chip. My 2008 has the lift 8 in with 37's and am getting 12 mpg

05-13-2008, 10:33 PM	#1 (permalink)
mjstef Senior Member Join Date: Oct 1999 Location: Big Sky country Western Montana Posts: 2,855 iTrader: (0) My Photos: (12)	6.4 Sucks Fuel!!!!!! One of our contractors stopped in tonight to BS. He has an 08 550 Reg Cab 4x4 Automatic with 12,000 miles on it and while it has been problem free it averages 6.8 MPG mixed driving and 8.5 on the highway!!! It weighs right at 12,000# They have 3 other 6.4's getting similiar mileage while the old 7.3's in the fleet get almost double! My 99 Peterbuilt Dumptruck does 6.5 mpg in mixed driving with a 500HP Red Top Cummins in it at 54,000#!!! My 92 Shop Truck with a 460 GASSER does better than that pig at almost 12 in town and 14 highway!! Is there ANY help for mileage in these trucks???? __________________ 05 Expedition 5.4 3 valve. (It does better in the mileage catagory on the interstate than my 6.0 EVER did!!!!) GONE!!!!!!2003 F250 CC 4x4 <font color="red"> 6.0 PSD</font> 6 Speed, 3.73 XLT Dark Shadow Gray ,Moonroof, Camper Package, Skid plates ect. (Gutless PIG from idle to 1800) May 12th 03 build week. 122,000 miles as of 01/01/07......... 4" exhaust and AFE intake b&w turnover ball. Flashed 6 times, EGR cooler replaced, VVRT solenoid replaced, Turbo Ped Replaced, EGR valve replaced 2X NO LEAKS!!! 8 new injectors, new fuel pump, new FICM, new ball joints, Exaust manifold gaskets, both front wheel bearing assy's, The list goes on and on!!! Former trucks: 89 F250 2wd 7.3 5spd with 256K when sold 94 F250 4X4 IDI Turbo 7.3 5 spd 160K when sold 95 F250 S/C 4x4 PSD 5 spd with 146K when sold 00 F250 C/C 4X4 PSD 6 Spd with 126K when sold (160K now) None of these trucks EVER spent a day in the shop!!!!

05-14-2008, 08:05 AM	#2 (permalink)
meg69 Senior Member Join Date: Sep 2007 Posts: 111 iTrader: (0) My Photos: (0)	So far the only reliable way to get better mileage is to slow down and drive the thing like a 80 yr old lady. OR toss your warranty out the window and do a EGR/DPF/DOC delete and use a programmer to disable the regen cycle. __________________ 08 F250 CC SRW SWB 4x4 6.4L PSD Thirstiest damn diesel I have ever owned.

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05-14-2008, 04:09 PM	#3 (permalink)
dsltek Member Join Date: May 2008 Location: The MoToRcItY Posts: 78 iTrader: (0) My Photos: (0)	had a customer come in a complain of fuel mileage. 08 f-450 drw crew cab 4x4. ummm lets see. huge trk.....towing.....low tire pressure......ummm oh forgot the 4.88 rear end oh and trying to stay at 75-80. ahhhh duh ur only getting 8-9mpg. these vehicle say right on the window sticker. THIS VEHICLE IS NOT RATED FOR FUEL ECONOMY.....which means u get whut u get! ie: drive slower buddy

05-14-2008, 08:34 PM	#8 (permalink)
mjm11 Junior Member Join Date: Jan 2008 Posts: 8 iTrader: (0) My Photos: (0)	I found the best way to solve the 6.4 MPG issue...a Toyota Yaris. I bought one for 12 grand and it gets 39 MPG. I guess the good ole days are gone forever to greed. The F450 will only see use on camping trips and to haul stuff. I don't regret trading the 2005 D-max in, it only got 16.5 with a banks six gun. I do regret that I could not see into the future and see that fuel would be so much I don't want my fifth wheel and sweet assss F450. Mike

05-14-2008, 08:39 PM	#9 (permalink)
Power12 Junior Member Join Date: Dec 2007 Location: Idaho Posts: 9 iTrader: (0) My Photos: (0)	I have a 2008 f-250 with an 8 in. lift and running 37's I set the SCT Extreme on 120 with elevation 2800 ft and I'm getting 12 mpg hand calculated. But I expect that from a pick-up. Everyone knows fords aren't known for gas mileage but they look dang good.

05-14-2008, 08:58 PM	#11 (permalink)
Power12 Junior Member Join Date: Dec 2007 Location: Idaho Posts: 9 iTrader: (0) My Photos: (0)	That's my husband 7.3 and it gets 17 with 90,000 miles on it and the ts performance chip. My 2008 has the lift 8 in with 37's and am getting 12 mpg

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