Mileage Help Please!
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Senior User
Joined: Oct 2005
Posts: 179
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From: Paw Paw, MI
Mileage Help Please!
I have a 99 F350 SRW with superchips programmer, 4 inch exhaust, and K&N filter. Within the past couple of months my mileage has gone to crap. I was getting 17mpg on the highway, even with towing. Now I can't get better than 13 on the highway. I changed the fuel filter and cleaned the K&N, but still no better. Does anyone have any ideas on what could cause such a drop? I would appreciate any help! Thank you!
Senior User
Joined: Jul 2004
Posts: 399
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From: Milwaukee
I had the same problem.. my 00 F-350 DRW was getting 5-9 highway and 2-4 city (with trailer.) I fooled around trying to fix it myself for over a month. Nothing worked! Took it to Schmit Ford... they found that my waste gate got stuck open because of carbon build up. Paid $400.00 to have it cleaned and rebuilt. Still no improvement. Took her to a diesel shop and am now getting 21 hwy!! Not much I could do! Hopefully yours works out better (and cheaper!!)
Junior User
Joined: Jan 2005
Posts: 71
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Please do! I'd sure like to know what the diesel shop did also. I work 70 miles round trip every day (not reimbursible mileage) and I've done the following to increase economy:
Zoodad mod
Kwik filter
Predator economy tune (disciplined foot)
4" dp, 5" exhaust
Diesel Kleen fuel additive
recent fuel filter change
tire pressure - good
reg oil change (Rotella -T)
I know, smaller, narrower tires (ugh!) and less driving, is that all?
Love my truck, but boy, these fuel prices are killin' me!
Zoodad mod
Kwik filter
Predator economy tune (disciplined foot)
4" dp, 5" exhaust
Diesel Kleen fuel additive
recent fuel filter change
tire pressure - good
reg oil change (Rotella -T)
I know, smaller, narrower tires (ugh!) and less driving, is that all?
Love my truck, but boy, these fuel prices are killin' me!
Junior User
Joined: May 2003
Posts: 81
Likes: 0
You just can't leave someone hanging with a statement like that. Do tell what they did, please! I just bought an '02 350 CC LB 4x4 and my mileage is pretty poor also. I am not expecting great mileage, but I know I can do better that 13-14 on a non lifted truck with stock size tires. I have the 6637 and fuel filter ready to go, Rotella synthetic, and a Sonnax valve ready to put in (I know that the Sonnax will not help mileage).
Last edited by NoAZ'68; Oct 13, 2005 at 10:17 AM. Reason: spelling errors
