average mpg - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 04-29-2009, 12:25 AM Thread Starter
 
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average mpg

How acurate is the mpg gauge in my new truck. when i do 110km per hour on cruise control it says i am only getting 16mph or 18/21 litres per hundred kms . I only have 900 kms as of today. Ive heard diesels get better with time. Although mileage is very low on my list of concerns I was just wondering if anyone could tell me about their fuel consumtion thanks
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post #2 of 9 (permalink) Old 04-29-2009, 10:55 AM
 
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The accuracy, or lack thereof, differs greatly on these trucks. We don't call it the "lie-o-meter" without good cause. Yoiur best bet is to hand-calculate your mpg (or kpl or whatever the metric version is....d*mn Canucks....). Yes, as the motor breaks in you will likely see some improvement in fuel economy, BUT...you just have to accept the fact that until you remove the CAT/DPF and tune that bad boy, your economy is gonna suck.

My truck stock (08 F250 FX4 CC w/3:73) was getting about 15 mpg in mixed hwy/cty. I could squeak out maybe 16.5 on the open road for longer runs. Since removing my CAT/DPF and running the Spartan 275 I am seeing 19-19.5 mixed, haven't gotten on the road for a long trip yet. That is hand-calculated as my lie-o-meter says 21.3 mpg as of my drive to work this morning.....
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post #3 of 9 (permalink) Old 04-29-2009, 03:30 PM Thread Starter
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Originally Posted by Craig02711 View Post
The accuracy, or lack thereof, differs greatly on these trucks. We don't call it the "lie-o-meter" without good cause. Yoiur best bet is to hand-calculate your mpg (or kpl or whatever the metric version is....d*mn Canucks....). Yes, as the motor breaks in you will likely see some improvement in fuel economy, BUT...you just have to accept the fact that until you remove the CAT/DPF and tune that bad boy, your economy is gonna suck.

My truck stock (08 F250 FX4 CC w/3:73) was getting about 15 mpg in mixed hwy/cty. I could squeak out maybe 16.5 on the open road for longer runs. Since removing my CAT/DPF and running the Spartan 275 I am seeing 19-19.5 mixed, haven't gotten on the road for a long trip yet. That is hand-calculated as my lie-o-meter says 21.3 mpg as of my drive to work this morning.....
So are you getting better mileage because of the delete or is it because the truck consumes more fuel during the regen process. I guess what im saying is if you could just tune the truck to run without regenning would you then see an increase in mileage also
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post #4 of 9 (permalink) Old 05-01-2009, 10:21 AM
 
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The short answer to your question is "yes" - the gains are a result of removing the DPF/CAT and the Spartan 275 tune.

You would see minimal gains with a DPF-on tune. Shutting down the regen process while still having the DPF in place would be counter-productive, as the filter would begin to clog, increase backpressure - which would lead to degraded performance. Removing the DPF eliminates restriction of airflow, leading to better performance. The truck breathes better, is more responsive, better HP, better MPG, and a lot more fun to drive! It is easy - all you need are a couple of hand tools, some beer and maybe a friend to help out. Easy to put the DPF back on if you need to take it in for warranty work too...

If you want a noticeable gain, you have to remove the DPF. With the Spartan tunes, your fuel economy gets better as you go higher in the tunes - I went from the 210 to the 275 and saw an increase of 2.5-3mpg.
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post #5 of 9 (permalink) Old 05-01-2009, 11:18 PM Thread Starter
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thank you very much
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post #6 of 9 (permalink) Old 05-02-2009, 12:35 PM
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i believe the numbers on the screen....i live at the bottom of a bowl...in 7 miles climbing 2500ft it shows 9.5 mpg ....once on top i reset it and get 18 mpg and on a stretch of flat road that is 15 miles long i get 22mpg....thats with a 3.55 diff. and 18" wheels [1750 rpm/65mph]. just like the book says...it averages out driving history. where you live and drive makes a big difference...i'm only on my 3rd tank and hand calculate at 15.6 mpg. i bet i lived in the flatlands my numbers would be alot higher.
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post #7 of 9 (permalink) Old 05-11-2009, 02:58 AM
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i have 73000 km on my truck and i get 16 average per 100 km on hwy and 18 in the
city . when i got the truck i was getting 20 to 21 per 100 km

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post #8 of 9 (permalink) Old 05-13-2009, 12:52 PM
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Quote:
Originally Posted by 2008fx4diesel View Post
i have 73000 km on my truck and i get 16 average per 100 km on hwy and 18 in the
city . when i got the truck i was getting 20 to 21 per 100 km
took me a while to figure what your numbers meant....you're burning 16 LITERS per 100 kms NOW and when the truck was NEW it was burning 21 ltrs per 100 kms....thats a very nice improvement.......but only 14.74 mpg
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post #9 of 9 (permalink) Old 05-13-2009, 02:40 PM
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110 liter tank was doing 560km stock. Spartan 1000km driving the same, 700km at 160km/h
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