20 Mpg!
Senior User
Joined: Jun 2006
Posts: 154
Likes: 0
From: Mount Juliet, TN
Hey guys. I do this alot and have it down pretty good. Run 3-4 tanks and divide your mileages by the number of gallons. I round up to 2 decimal places. this is an essential practice for long distance riders (harley's) as you don't want to rely on a **** poor gas gauge while cruising diagnollay across Wyoming without really knowing what your remianing distance is concerning fueel.
3-4 tanks in a row gives you a really good average and enough accuracy to judge by imho.
My PSD gets 16 hwy, 18 FWY empty... and it accounts for differences in air temp, presure, fuel quality, and driving habits :-)
3-4 tanks in a row gives you a really good average and enough accuracy to judge by imho.
My PSD gets 16 hwy, 18 FWY empty... and it accounts for differences in air temp, presure, fuel quality, and driving habits :-)
Junior User
Joined: May 2007
Posts: 88
Likes: 0
Think I posted in another thread but I ran a test on my 96 PSD after adding a Tymar intake & SuperChips Tow Safe program. My truck is bone stoke other that mentioned mods.. I was surprised...In mixed hyway & country roads driving .i averaged 22.5 MPG !!! I double checked my figures..
I set CC on 60-65 and drove by foot on country roads..
Towing so far I get from 12.5 -15 mpg depending on roads and SPEED.
Went 365 miles on 16.2 gallons of fuel..
I can't wait until I install my Tymar down pipe.
Wanted to gut cat but dear old Virgina may start diesel emission testing..
I set CC on 60-65 and drove by foot on country roads..
Towing so far I get from 12.5 -15 mpg depending on roads and SPEED.
Went 365 miles on 16.2 gallons of fuel..
I can't wait until I install my Tymar down pipe.
Wanted to gut cat but dear old Virgina may start diesel emission testing..
Thread Starter
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Elder User
Joined: May 2007
Posts: 999
Likes: 0
Originally Posted by 60man
Think I posted in another thread but I ran a test on my 96 PSD after adding a Tymar intake & SuperChips Tow Safe program. My truck is bone stoke other that mentioned mods.. I was surprised...In mixed hyway & country roads driving .i averaged 22.5 MPG !!! I double checked my figures..
I set CC on 60-65 and drove by foot on country roads..
Towing so far I get from 12.5 -15 mpg depending on roads and SPEED.
Went 365 miles on 16.2 gallons of fuel..
I can't wait until I install my Tymar down pipe.
Wanted to gut cat but dear old Virgina may start diesel emission testing..
I set CC on 60-65 and drove by foot on country roads..
Towing so far I get from 12.5 -15 mpg depending on roads and SPEED.
Went 365 miles on 16.2 gallons of fuel..
I can't wait until I install my Tymar down pipe.
Wanted to gut cat but dear old Virgina may start diesel emission testing..
Senior User
Joined: Oct 2006
Posts: 122
Likes: 0
Originally Posted by 60man
Think I posted in another thread but I ran a test on my 96 PSD after adding a Tymar intake & SuperChips Tow Safe program. My truck is bone stoke other that mentioned mods.. I was surprised...In mixed hyway & country roads driving .i averaged 22.5 MPG !!! I double checked my figures..
I set CC on 60-65 and drove by foot on country roads..
Towing so far I get from 12.5 -15 mpg depending on roads and SPEED.
Went 365 miles on 16.2 gallons of fuel..
I can't wait until I install my Tymar down pipe.
Wanted to gut cat but dear old Virgina may start diesel emission testing..
I set CC on 60-65 and drove by foot on country roads..
Towing so far I get from 12.5 -15 mpg depending on roads and SPEED.
Went 365 miles on 16.2 gallons of fuel..
I can't wait until I install my Tymar down pipe.
Wanted to gut cat but dear old Virgina may start diesel emission testing..
Justin
Junior User
Joined: May 2007
Posts: 88
Likes: 0
Justin: I tow a 26' enclosed car trailer with Drag car and parts for racing....
Don't know if it helps mileage but I run synsethic trans fluid & rear end lubes...but I feel safer...less heat. Also use Diesel-Kleen fuel additive..
On PA TPK (Mountians) I get 12-12.5.....on OHIO TPK (Flat !) I'll get 13-15...depending on SPEED.. I try to stay at 60-65 towing..Keep rpm's down and stay off boost and all is good..
Don't know if it helps mileage but I run synsethic trans fluid & rear end lubes...but I feel safer...less heat. Also use Diesel-Kleen fuel additive..
On PA TPK (Mountians) I get 12-12.5.....on OHIO TPK (Flat !) I'll get 13-15...depending on SPEED.. I try to stay at 60-65 towing..Keep rpm's down and stay off boost and all is good..
Senior User
Joined: Oct 2006
Posts: 122
Likes: 0
Originally Posted by 60man
Justin: I tow a 26' enclosed car trailer with Drag car and parts for racing....
Don't know if it helps mileage but I run synsethic trans fluid & rear end lubes...but I feel safer...less heat. Also use Diesel-Kleen fuel additive..
On PA TPK (Mountians) I get 12-12.5.....on OHIO TPK (Flat !) I'll get 13-15...depending on SPEED.. I try to stay at 60-65 towing..Keep rpm's down and stay off boost and all is good..
Don't know if it helps mileage but I run synsethic trans fluid & rear end lubes...but I feel safer...less heat. Also use Diesel-Kleen fuel additive..
On PA TPK (Mountians) I get 12-12.5.....on OHIO TPK (Flat !) I'll get 13-15...depending on SPEED.. I try to stay at 60-65 towing..Keep rpm's down and stay off boost and all is good..
Thanks I just wanted a comparison. I pull a 12,000 pound fifth wheel RV and get 12-13 on the flat ground and 10-11 in the mountains.
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Junior User
Joined: May 2007
Posts: 88
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Originally Posted by Justin Time
Thanks I just wanted a comparison. I pull a 12,000 pound fifth wheel RV and get 12-13 on the flat ground and 10-11 in the mountains.
I want to run another empty mpg test just to see..
New User
Joined: Aug 2007
Posts: 4
Likes: 0
i have a f350 powerstroke, it normally got 18 mpg empty, it dropped to 11.4 mpg it also got same mpg with camper, i dont understand why. i have changed air sensor and injectors, still 11.4 mpg. ford mechanics say everthing looks good on diganostics test.does anyone have good guess, if so please help. the only thing i have is 3.5 exhaust and no muffler. please help. i drove 2700 miles at 11.4 mpg.
Junior User
Joined: May 2007
Posts: 88
Likes: 0
Originally Posted by mhp11543
i have a f350 powerstroke, it normally got 18 mpg empty, it dropped to 11.4 mpg it also got same mpg with camper, i dont understand why. i have changed air sensor and injectors, still 11.4 mpg. ford mechanics say everthing looks good on diganostics test.does anyone have good guess, if so please help. the only thing i have is 3.5 exhaust and no muffler. please help. i drove 2700 miles at 11.4 mpg.
My truck doesn't do that bad towing up a BIG mountain...
New User
Joined: Aug 2007
Posts: 4
Likes: 0
thanks for the reply: what i did not say was this is with an all stock truck, the 2700 miles were driven on inerstate and cc, i also have new air filter. i drove this truck in jan.. on 400 mile trip the first 150 miles were at 11.4 mpg. then it jumped back to 17.5 to 18 mpg. this was empty now it is back down to 11.4 empty or with 3000# camper on truck, it gets same milege ?????? please some one help.
Posting Guru
Joined: Dec 2005
Posts: 1,034
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Originally Posted by mhp11543
thanks for the reply: what i did not say was this is with an all stock truck, the 2700 miles were driven on inerstate and cc, i also have new air filter. i drove this truck in jan.. on 400 mile trip the first 150 miles were at 11.4 mpg. then it jumped back to 17.5 to 18 mpg. this was empty now it is back down to 11.4 empty or with 3000# camper on truck, it gets same milege ?????? please some one help.
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
Originally Posted by DAVID'S97F250HD
Check to make sure your exhaust back pressure tube is not plugged, do a search on it, its a tube of the sensor on the right front of the engine and the tube goes into the right manifold.
Do you have some pics?
Thanks