TERRIBLE mileage on my 5spd cummins!! 11mpg city!
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Being Evaluated
Joined: Feb 2010
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From: Buffalo, NY
Heh, it's hard to get good fuel mileage when you can't keep the 
-eatin grin off your face and the go-pedal on the floor! Those mods on your truck probably woke up a sleeping beast. I know when I had my '97 5-spd dually and did the fuel plate, exhaust, bhaf...i felt like I was driving a new truck and probably got about 10mpg for the first few tanks until the excitement wore off! 
Even after those mods, it still got 26mpg best, 22mpg avg, and 19mpg hooked. I loved that truck
-eatin grin off your face and the go-pedal on the floor! Those mods on your truck probably woke up a sleeping beast. I know when I had my '97 5-spd dually and did the fuel plate, exhaust, bhaf...i felt like I was driving a new truck and probably got about 10mpg for the first few tanks until the excitement wore off! Even after those mods, it still got 26mpg best, 22mpg avg, and 19mpg hooked. I loved that truckyeah i'm sure comparing a common rail to 12v is a bit outrageous, and 22 is going downhill at 75mph for 150 miles running at 1700rpm, 3.73's and 40" tires makes for low cruising rpm's, but usually i get 17-18 on the interstate and 11-15 around town, i'm not gonna complain though, it's better than a gasser and alot more fun
gassers what a waste of time. Diesel all the way
But I may consider getting a common rail in a few years (if I get bored of my 12v)
Last edited by Benjamin; Mar 24, 2010 at 11:37 AM.
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Being Evaluated
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From: Buffalo, NY
Ya I was ******* the **** out of my truck after I did the exhaust, intake and plate. Got a 14mpg all city. I'm going on a 12 hour round trip saturday where I was getting 19.33 mpg before all my mods. I'll report back after I return my highway mileage.
Diesel Wrench
Joined: Mar 2007
Posts: 714
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From: York,PA
Hmmm..
I always get a good chuckle out of guys when they start threads like this.You look over their respective signatures with their list of mods and research their past posts and then you come back and reread about their whining of no fuel milage.
Performance mods and fuel milage usually do not go hand in hand.If its fuel milage you want then IMO you should have left the truck stock or bought yourself a import truck.
Fuel milage is so over-rated
I always get a good chuckle out of guys when they start threads like this.You look over their respective signatures with their list of mods and research their past posts and then you come back and reread about their whining of no fuel milage.
Performance mods and fuel milage usually do not go hand in hand.If its fuel milage you want then IMO you should have left the truck stock or bought yourself a import truck.
Fuel milage is so over-rated
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Being Evaluated
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From: Buffalo, NY
I'm not sure I follow, since import trucks get THE worst mileage ratings compared to us trucks, and secondly the easier a diesel breathes and fuels the better mileage it gets. Its a win-win with these. And since cummins is notorious as bneing the mileage king I couldn't fathom why my STOCK 12v got 11mpg
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Being Evaluated
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From: Buffalo, NY
Well I'm pissed. From NY to hagerdstown MD, 6 hours 1-way, I maintained a steady 68-71mph. Very easy on the throttle, only 3 peopel in the truck and 1k lbs of sand bags in the bed. Averaged like 16 measly mpg!! Wtf??? When my truck was stock, had a 3year old fuel filter and air filter all gunked up, stock exhaust and no plate i got 19.33mpg going 80-85 VERY consistantly. Now that I'm modded and in theory should be getting better mileage, I got TERRIBLE mileage. Perhaps I got really REALLY bad winter-blend fuel before going to MD? I dunno.
On the way back from MD, I was pissed and said f*ck it and ran like 80-85mph. I'm still on the same tank of fuel with a tick over quarter tank left, and I've ragged this tank a few times out of angst for pooey mileage. Whats happening? Is my afc tuned really bad or something? Would what be causing this poor mileage?
I know one thing; I raced some newer volkswagen gti and turbo audi today, and lets just say from a 60 roll up till like 90mph they were getting further and further away
On the way back from MD, I was pissed and said f*ck it and ran like 80-85mph. I'm still on the same tank of fuel with a tick over quarter tank left, and I've ragged this tank a few times out of angst for pooey mileage. Whats happening? Is my afc tuned really bad or something? Would what be causing this poor mileage?
I know one thing; I raced some newer volkswagen gti and turbo audi today, and lets just say from a 60 roll up till like 90mph they were getting further and further away
