7.3 Psd Drop In Mpg - Ford Powerstroke Diesel Forum
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post #1 of 23 Old 02-05-2007, 04:08 PM Thread Starter
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7.3 Psd Drop In Mpg

Im wondering if one you guys have the same problem. Iwas getting 22mpg hwy in my 96 PSD and now im getting about 12 mpg hwy empty the truck has 80,000 miles on it. im about to try lucas oil fuel treatment to see that will bring it back up. im also going to try power source cetane booster to see that helps. this driving me crazy. this problem didnt happen over night . it slowly got worse and worse. does anyone had this problem that can help.
thanks.
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post #2 of 23 Old 02-05-2007, 04:14 PM
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How is it running now? My truck has dropped from 15 to about 13.5 in th past 3 years. Have you added a chip or tuner? I feel like mine is from degrading injectors. You may want to get it scanned for codes and get your injectors checked.

Derrick

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post #3 of 23 Old 02-05-2007, 04:22 PM
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It could be from any number of things.

If it goes gradually it is just something you need to get on top of. If it goes fast there is a bigger issue.
post #4 of 23 Old 02-05-2007, 04:23 PM Thread Starter
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it seemed to be running fine but its just sucking the fuel down. i have no performance addons.
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post #5 of 23 Old 02-09-2007, 11:11 PM
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Hey tjazz, welcome to powerstroke, how did you make out with your millage issue. Were you doing the millage calculations by hand?

Gord.

SKILLFULLY DISGISED AS A RESPONSABLE ADULT.




99.5 F350, CC, LB, DRW.
7.3 AUTO 4.10s
AUTOMETER C2s EGT, TRANS, BOOST, OIL, FUEL PRES
ATS, WW, SSHPX, B ANNIH.
DP 6P 140EX.
AFE MAG F STG 2.
MAGNAFLOW 4'' TURBO BACK DUALS.
US GEAR SUPER D-CELERATOR
500LTR FUEL TANK
BILLET GRILL
ALARM & REM START/ ELC BAT DISC.
CB, SAT, GPS, PANASONIC CD, 5th WHL
35' GOLDEN FALCON

Been a mod longer than TJ hahaha
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post #6 of 23 Old 02-11-2007, 05:56 PM
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If you noticed it recently there are 2 major factors that I've seen IN my OWN truck (I've documented every drop of diesel that's gone in it for the past 30+ thousand miles).


Ultra Low Sulphur Diesel - less energy per unit volume then LSD = takes more fuel to go the same distance.

and

Winter Blend Fuel - less energy per unit volume compared to summer blend fuel. Once again = takes more fuel to go the same distance.

2001 F250
11.62 @ 115.79
Owner of Marty's Diesel
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post #7 of 23 Old 02-12-2007, 10:53 AM Thread Starter
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Quote:
Originally Posted by straycat View Post
Hey tjazz, welcome to powerstroke, how did you make out with your millage issue. Were you doing the millage calculations by hand?

Gord.
well i started using lucas oil fuel treatment and it gained from 12 to 16.5 mpg (that hwy and city mixed)Im doing calulations by hand. i probily will pick up more if i go all hwy miles. hopfuly i find out soon if will do any better on the hwy. so far im impressed with the lucas oil fuel treatment. i would recomend it to everybody to try it. Next thing im going to try is the power source cetane booster (diesel clean w/cetane booster) to see if i gain some more. ill let you guys know what happens.

im sure glad i found this site . Im a big fan of the power stroke engines. Its the best truck i ever bought (w/ the power stroke).

Tony

Last edited by tjazz_viking; 02-12-2007 at 10:55 AM.
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post #8 of 23 Old 02-12-2007, 11:09 AM
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winter blend fuel and low sulfur fuel will both cause this concern ,like maintain
said

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post #9 of 23 Old 02-12-2007, 10:53 PM
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Glad to hear it's coming up, keep us posted on all the little goodies you try.

Gord.

SKILLFULLY DISGISED AS A RESPONSABLE ADULT.




99.5 F350, CC, LB, DRW.
7.3 AUTO 4.10s
AUTOMETER C2s EGT, TRANS, BOOST, OIL, FUEL PRES
ATS, WW, SSHPX, B ANNIH.
DP 6P 140EX.
AFE MAG F STG 2.
MAGNAFLOW 4'' TURBO BACK DUALS.
US GEAR SUPER D-CELERATOR
500LTR FUEL TANK
BILLET GRILL
ALARM & REM START/ ELC BAT DISC.
CB, SAT, GPS, PANASONIC CD, 5th WHL
35' GOLDEN FALCON

Been a mod longer than TJ hahaha
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post #10 of 23 Old 04-11-2007, 10:37 PM
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Check for leaks. I had what looked like a small leak, about one drop every 5 seconds. Mileage went from 18 to 7.5MPG.
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