STROKER_T Posted August 12, 2009 Share Posted August 12, 2009 Anyone got any ideas for fuel mileage concern on an 03 F350?... I installed 3 much need injectors on this truck last week,runs like a scalded dog now,but customer went to Florida and says he was averaging only 5 mpg.Not a happy camper,he makes the same run to Florida 3 times or more a month transporting boats...he keeps up with the fuel mileage,he also maintains his truck very well.The truck has 156,000 miles.Thanks for any help or advise... Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted August 12, 2009 Share Posted August 12, 2009 I'm assuming it has the 06E17, which has its share of MPG complaints. I'd do a basic performance analysis looking hard at the VGT and FP check, and I'd be looking for a restricted cat. Maybe monitor EBP_G (I think it still works, even with the flash) or backprobe the EBP physically (I know it's still powered up, just ignored), or put a physical gauge in the pipe in a tapped hole forward of the cat. You can flash it to an older level to eliminate the 06E17, but it's a HUGE time wasting PIA and probably not legal, either. IMHO, most economy complaints are driver related. Go for a cruise with the IDS "econometer" open and see what it reads. If the bonehead pulls a bigass heavy boat going 75MPH, he's gonna get 5MPG. Good Luck! Quote Link to comment Share on other sites More sharing options...
Mikill Posted August 13, 2009 Share Posted August 13, 2009 It's a F-350 and he's towing. More than likely he is not going to get good fuel mileage. Quote Link to comment Share on other sites More sharing options...
eastendpowerstroke Posted August 13, 2009 Share Posted August 13, 2009 Quote: =Bruce Amacker You can flash it to an older level to eliminate the 06E17, but it's a HUGE time wasting PIA and probably not legal, either. OK do tell? I'd love to have the original split shot flash back in my truck,it was nice and quiet. FWIW my F350 gets 15-19 mpg towing the mustang on the car trailer approx 4400 lbs at 70+ mph. Quote Link to comment Share on other sites More sharing options...
rlchv70 Posted August 13, 2009 Share Posted August 13, 2009 Small fuel leak? Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted August 13, 2009 Share Posted August 13, 2009 "I'm told" but I have not done this myself: >Uninstall the current WDS (what's that, right?) version from the WDS >Locate an old WDS disc from the pre-06E17 days >Load this onto the WDS >Program the PCM using as-built data, because it won't recognize the installed calibration >Then update the program using the WDS There's a lot of programming gurus on this forum, and I'm sure there are some holes in this info, which is a couple of years old. Let me know if this is possible. Good Luck! Quote Link to comment Share on other sites More sharing options...
STROKER_T Posted August 13, 2009 Author Share Posted August 13, 2009 OK,I've been all over this truck trying to find cause and even pulled the injectors I replaced out again to inspect,all looks good.Customer says he gets 14-17 mpg,and I believe him...says after repair was done he now has it calculated to 5 mpg,showed me receipts of all the fuel stops he made from florida to SC,$420.00 worth.WOW...I did reprogram the FICM,surely that didn't cause this,but who knows? Putting it back together,then I plan to run a fuel economy test,since it's available...thanks for all the input guys,this has got me Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted August 13, 2009 Share Posted August 13, 2009 Tell him to run it a bit, or let you drive it for a few days. Maybe he had a headwind, which will KILL your MPG. Quote Link to comment Share on other sites More sharing options...
dieseldoc Posted August 14, 2009 Share Posted August 14, 2009 FWIW In my personal 06' F-250 4X4 6spd with 3.73 gears, the worst I have ever gotten is 10mpg towing. That day was a 15mph wind and I was loaded at a GVW of about 21000lbs. I was runnning 68mph. Now granted in the lovely state of ND we dont have many hills or mountains where I was headed but still. In my opinion that heavy that fast and still got 10 MPG is pretty good. Quote Link to comment Share on other sites More sharing options...
Shlep Posted August 16, 2009 Share Posted August 16, 2009 I get 14-18mpg empty and towing a 32ft 5th wheel that tips the scales at or about 10,000lbs loaded I average about 11-12 travelling 60-70mph on a recent vacation to Niagara Falls with an 06 350 crewcab dually w/4:10s so depending on his driving style and the weight of the boat I'd say 5 might be low but who's to say. Quote Link to comment Share on other sites More sharing options...
Aaron Posted August 16, 2009 Share Posted August 16, 2009 I got 15.5 with a 6.4 at 70-80MPH towing about 8,000 LBS across Canada. But like he said ^^ driving style plays a big part of it. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted August 16, 2009 Share Posted August 16, 2009 What do you do shut it off and put the key on the seat when going down hill? Quote Link to comment Share on other sites More sharing options...
Aaron Posted August 16, 2009 Share Posted August 16, 2009 75, on cruise control for the most part. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted August 16, 2009 Share Posted August 16, 2009 Are you drafting with tractor trailers? Quote Link to comment Share on other sites More sharing options...
Aaron Posted August 16, 2009 Share Posted August 16, 2009 Not at 75mph in Ontario Apparently trucks are governed at 65mph (105km/h) in Ontario. Quote Link to comment Share on other sites More sharing options...
Shlep Posted August 17, 2009 Share Posted August 17, 2009 Not at 75mph in Ontario Apparently trucks are governed at 65mph (105km/h) in Ontario. Not that you'ld notice, looks like they're not going to enforce it Quote Link to comment Share on other sites More sharing options...
Aaron Posted August 18, 2009 Share Posted August 18, 2009 Yeah, or if any of the trucks even have the speed limiter on 'em...I got passed at 130 on the weekend... Just like they enforce everything else, I guess. Quote Link to comment Share on other sites More sharing options...
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