yes another mpg problem! - Competition Diesel.Com

covey88 · 09-01-2009, 06:39 PM

ok so i had a trip this weekend of just under 300 miles, all highway minus 50miles city. so i was expecting the truck to pull some great mpg! i drove 65(in ohio) and 70(in west virgina) it never got more then 14lbs of boost, and never got over 1000*, these boost # and temps were in the city in WV. so it should of done good right! WRONG only 18.2 mpg!!! i get 17 in the city and not really babying it! how am i only getting 1 mpg better on the highway?????

please help!

kas83 · 09-01-2009, 07:52 PM

What gears? Get a good tranny in there, or at least a tighter torque converter, so you're not wasting fuel while accelerating either.

covey88 · 09-01-2009, 08:07 PM

3.54 gears, yep new tranny put in it in march! it pulls 17 daily driving and i am not hard on it but i do not drive like a old lady either! so i can not figure out why it only got 1 mpg better on the highway!!!!!!

rs359 · 09-02-2009, 02:21 AM

My in town mileage is only 13 I have gotten around 21 but this was cruising about 50 mph (no boost) I get about 16 at 75 (10-12 lbs of boost) less if I drive faster the key seems to be keeping the Boost low or none. I am tempted to try and disconnect the Boost reference to the afc to see if that helps. Rich

kas83 · 09-02-2009, 01:31 PM

What kind of tires are you running, and what size?

covey88 · 09-05-2009, 04:48 PM

maxxis buckshoots but they are about wore out so i will be getting more street style tires then mud! oh they are 285/75/16 thanks guys!

kas83 · 09-06-2009, 12:19 AM

Are those radials? That style of tire isn't very well suited to mpg. I've seen some mud style tires return relatively good mpg, but most of the time, they don't do well. I had some cheap bargain mudders on my truck when I got it, and upgraded to a set of Cooper Discoverer ATR's, all terrain, and gained a solid 2 mpg on the highway.

Cummins Driver · 09-06-2009, 03:44 AM

I got 18.8 mpg on my last tank of daily driving. Mainly 50-60mph driving on some curvy roads with rolling hills. That wasnt driving extremely easy, but definately not hard most of the time. I have 265 Kuhmo M/T's on my truck right now.

I have gotten 22mpg on the interstate. Im not sure why you arent getting any better than 18 on the open road. Timing looks good. is your fuel filter clean?

Eric

09-01-2009, 06:39 PM	#1
covey88 Name: covey88 Title: Diesel Enthusiast Status: Not Here Join Date: Dec 2007 Location: ohio Member`s Gallery Posts: 114	yes another mpg problem! ok so i had a trip this weekend of just under 300 miles, all highway minus 50miles city. so i was expecting the truck to pull some great mpg! i drove 65(in ohio) and 70(in west virgina) it never got more then 14lbs of boost, and never got over 1000, these boost # and temps were in the city in WV. so it should of done good right! WRONG only 18.2 mpg!!! i get 17 in the city and not really babying it! how am i only getting 1 mpg better on the highway????? please help! __________________ 96 DODGE RAM 2500 extended cab 4x4 auto trans,it has a BHAF, I removed the cat. and muffler(straight piped 3"), 16.5timing and moved afc housing forward and a custom ground 100 plate too, flipped the washer on the diaphragm in the afc, 4k gov kit, and 60lbs valve springs

09-01-2009, 07:52 PM	#2
kas83 Name: kas83 Title: Too Much Time Status: Not Here Join Date: Oct 2007 Location: Plover, WI Member`s Gallery Posts: 676	What gears? Get a good tranny in there, or at least a tighter torque converter, so you're not wasting fuel while accelerating either. __________________ 2000 F250 CC/LB V10 - possible 12v Cummins swap?

09-01-2009, 08:07 PM	#3
covey88 Name: covey88 Title: Diesel Enthusiast Status: Not Here Join Date: Dec 2007 Location: ohio Member`s Gallery Posts: 114	3.54 gears, yep new tranny put in it in march! it pulls 17 daily driving and i am not hard on it but i do not drive like a old lady either! so i can not figure out why it only got 1 mpg better on the highway!!!!!! __________________ 96 DODGE RAM 2500 extended cab 4x4 auto trans,it has a BHAF, I removed the cat. and muffler(straight piped 3"), 16.5*timing and moved afc housing forward and a custom ground 100 plate too, flipped the washer on the diaphragm in the afc, 4k gov kit, and 60lbs valve springs

09-02-2009, 02:21 AM	#4
rs359 Name: rs359 Title: Too Much Time Status: Not Here Join Date: Sep 2007 Location: Central FL Member`s Gallery Posts: 459	My in town mileage is only 13 I have gotten around 21 but this was cruising about 50 mph (no boost) I get about 16 at 75 (10-12 lbs of boost) less if I drive faster the key seems to be keeping the Boost low or none. I am tempted to try and disconnect the Boost reference to the afc to see if that helps. Rich __________________ 98 12v 3gsk,#6 plate ,370s,17deg,BHAF,5 inch exhaust,Suncoast trans, ATS converter,and others 94 Suburban 2wd 96 215 hp Cummins 47rh 89 D250 (PROJECT NOBUCKS) with 94 Cummins & intercooler stock for now

09-02-2009, 01:31 PM	#5
kas83 Name: kas83 Title: Too Much Time Status: Not Here Join Date: Oct 2007 Location: Plover, WI Member`s Gallery Posts: 676	What kind of tires are you running, and what size? __________________ 2000 F250 CC/LB V10 - possible 12v Cummins swap?

09-05-2009, 04:48 PM	#6
covey88 Name: covey88 Title: Diesel Enthusiast Status: Not Here Join Date: Dec 2007 Location: ohio Member`s Gallery Posts: 114	maxxis buckshoots but they are about wore out so i will be getting more street style tires then mud! oh they are 285/75/16 thanks guys! __________________ 96 DODGE RAM 2500 extended cab 4x4 auto trans,it has a BHAF, I removed the cat. and muffler(straight piped 3"), 16.5*timing and moved afc housing forward and a custom ground 100 plate too, flipped the washer on the diaphragm in the afc, 4k gov kit, and 60lbs valve springs

09-06-2009, 12:19 AM	#7
kas83 Name: kas83 Title: Too Much Time Status: Not Here Join Date: Oct 2007 Location: Plover, WI Member`s Gallery Posts: 676	Are those radials? That style of tire isn't very well suited to mpg. I've seen some mud style tires return relatively good mpg, but most of the time, they don't do well. I had some cheap bargain mudders on my truck when I got it, and upgraded to a set of Cooper Discoverer ATR's, all terrain, and gained a solid 2 mpg on the highway. __________________ 2000 F250 CC/LB V10 - possible 12v Cummins swap?

09-06-2009, 03:44 AM	#8
Cummins Driver Name: Cummins Driver Title: THE Cummins Driver Status: Not Here Join Date: May 2007 Location: Kentucky Member`s Gallery Posts: 2,405	I got 18.8 mpg on my last tank of daily driving. Mainly 50-60mph driving on some curvy roads with rolling hills. That wasnt driving extremely easy, but definately not hard most of the time. I have 265 Kuhmo M/T's on my truck right now. I have gotten 22mpg on the interstate. Im not sure why you arent getting any better than 18 on the open road. Timing looks good. is your fuel filter clean? Eric __________________ 94 Dodge 2500 4x4 Reg Cab Some fueling/HE351cw and a Semi-Built Auto 01 Dodge 3500 4x4 Dually Ext. Cab Home Built 47re and an Edge Juice/Attitue & Air Dog 93 D250 Club Cab A518 - THD Fuel Pin