Poor MPG
Moderator
Joined: Jul 2010
Posts: 12,049
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From: Media PA
You went 200 miles and then pumped 44.4 gallons of gas into the tank?...............Is your 4.5 truely hand calculated by dividing the miles driven by the gallons pumped to refill the tank? I have only once ever pumped over 44 gallons into mine and it was basically on fumes.
Well, your mileage is already improving...........
200 miles divided by 35 gallons equals 5.71 MPG, that's over 20% better (actually it's 27% better!) than your initial number of 4.5 MPG. Of course, it's still horrible so we will continue to come up with ideas to help and now I'm looking forward to the numbers from the next fill up. 
Thread Starter
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Senior User
Joined: Jan 2019
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I don't, but I honestly can't imagine this is the issue...
I live on a quiet street, in a small suburb.
That said, I will check my parking mode Dash Cam to see if there's any suspicious activity.
I live on a quiet street, in a small suburb.
That said, I will check my parking mode Dash Cam to see if there's any suspicious activity.
More Turbo
Joined: May 2015
Posts: 633
Likes: 142
From: Staten Island, NY
iIn my 39 years of experience in law enforcement, quite streets are the most desirable for criminals as they try not to be seen so I wouldn’t automatically assume it’s not happening. Do you think that the trip odometer is malfunctioning? Keep us informed, someone will solve the problem.
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Senior User
Joined: Jan 2019
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iIn my 39 years of experience in law enforcement, quite streets are the most desirable for criminals as they try not to be seen so I wouldn’t automatically assume it’s not happening. Do you think that the trip odometer is malfunctioning? Keep us informed, someone will solve the problem.
One thing I should nominate, I can visibly see the fuel needle drop even on relatively short... ahem... excursions. Like 1/8th - 1/16th movement for a 15-20 mile journey.
Laughing Gas
Joined: Oct 2017
Posts: 1,143
Likes: 13
From: ND
In the interest of ruling out possibilities, I've ordered a locking fuel cap from Amazon. Will be here in two days time.
One thing I should nominate, I can visibly see the fuel needle drop even on relatively short... ahem... excursions. Like 1/8th - 1/16th movement for a 15-20 mile journey.
One thing I should nominate, I can visibly see the fuel needle drop even on relatively short... ahem... excursions. Like 1/8th - 1/16th movement for a 15-20 mile journey.
1/2 gone= 180mi, or 18 gal
3/4 gone= 300 miles for me, or 30 gal
7/8 gone = 380 miles, or 38gal
I'm well below E before it's empty, never tried it, most i have put in was 40, but mine is horrible throughout entire range, but it is consistent
the fuel guages suck, don't look at visible drop
also these trucks qualify for heavy truck emissions, OBD1 standards stuff. don't assume because you don't have a check engine light, everything is good. put is this way, you can have a misfire (personally ran on 8/10 for a few miles once) and NO check engine light. that can really affect MPG too.......
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Senior User
Joined: Jan 2019
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1/4 gone = 70mi for me or 7 gal
1/2 gone= 180mi, or 18 gal
3/4 gone= 300 miles for me, or 30 gal
7/8 gone = 380 miles, or 38gal
I'm well below E before it's empty, never tried it, most i have put in was 40, but mine is horrible throughout entire range, but it is consistent
the fuel guages suck, don't look at visible drop
also these trucks qualify for heavy truck emissions, OBD1 standards stuff. don't assume because you don't have a check engine light, everything is good. put is this way, you can have a misfire (personally ran on 8/10 for a few miles once) and NO check engine light. that can really affect MPG too.......
1/2 gone= 180mi, or 18 gal
3/4 gone= 300 miles for me, or 30 gal
7/8 gone = 380 miles, or 38gal
I'm well below E before it's empty, never tried it, most i have put in was 40, but mine is horrible throughout entire range, but it is consistent
the fuel guages suck, don't look at visible drop
also these trucks qualify for heavy truck emissions, OBD1 standards stuff. don't assume because you don't have a check engine light, everything is good. put is this way, you can have a misfire (personally ran on 8/10 for a few miles once) and NO check engine light. that can really affect MPG too.......
Cargo Master
Joined: Oct 2006
Posts: 2,097
Likes: 5
From: chicago northwest suburbs
FWIW the first 1/4 tank from full will go fast due to the design of the tank. The rest of the 3/4 tank will go at the same rate.
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Senior User
Joined: Jan 2019
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no! Unless it is a California emissions vehicle. Those have OBDII software. Other like my 02 run OBDI software. It will not set a misfire or check eng light. But it will flash OD if it’s misfiring.
FWIW the first 1/4 tank from full will go fast due to the design of the tank. The rest of the 3/4 tank will go at the same rate.
Laughing Gas
Joined: Oct 2017
Posts: 1,143
Likes: 13
From: ND
a cheap reader will read o2 data etc, but none of the more advanced stuff
when i had misfires i had no indication other than sound/lack of power/ raw fuel smell. No OD light blinking, but mine is a 2000
Cargo Master
Joined: Oct 2006
Posts: 2,097
Likes: 5
From: chicago northwest suburbs
Yep federal emissions on anything over 8600lbs is considered heavy duty and doesn’t have the same emissions standards. I do believe today’s vehicles that has changed. But back in the early 2000’s that’s the way it was.
Moderator
Joined: Jul 2010
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From: Media PA
Right, it's the OBDII platform (PCM, sensors, harnesses and under dash port) but it's running earlier OBDI software due to the weight and EPA rules at the time of build. Even a lot of inspection shops are unaware of this and will fail rigs as showing "not ready", they will never be ready with OBDI data!