MPG results, 1000 mile bobtailing on 75 hp program - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 05-11-2009, 02:10 AM Thread Starter
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MPG results, 1000 mile bobtailing on 75 hp program

Hey guys, I actually did closer to 2000 miles (two round trips from SoMD to MA plus local driving) but got detailed numbers on the second round trip.

2008 XLT 4x4 crew cab, a/c on, 18 inch rubber, 75 hp Spartan, stock exhaust except for the CAT/DPF delete. Green filter element. 3 people on board, 100 lb dog, and probably 300lbs of gear.

I did the run up on Rte 95 to 91, with the cruise on at 5+ the speed limit, most of it was run between 65-70 mph. Got stuck in bumper to bumper traffic on the GW Bridge for 2.5 hours, basically idling.

402.1 miles on my odometer and it matched my GPS exactly. It took 22.04 gallons for 18.24 mpg.

I then did 178 miles of combination hilly back roads through central MA and some highway driving. Some throttle work, especially showing some family how the truck ran, and hit full boost a few times. 178 miles, 12.31 gallons for 14.46 mpg locally, and I wasn't driving mileage friendly.

Finally, made the run home today, all highway, same deal as before, ran mellow at speed limit or 5 above, one 20 minute run at 75 or so, but most at 70 mph. No stops except for coffee and nature breaks, no idling to speak of.

388 miles total, 20.94 gallons for 18.53 mpg

Overall for the measured portions of the run, which were all in a row, I did 968.1 miles for an average mpg of 17.52 mpg

So, whats all this baloney mean?

I have never seen over 16 mpg on this truck, period. Actually this same run was back to back 15.7 mpg runs with the stock filter. I have run the 75, the 125, and the 210. Usually on the highway it ran about 15.7 and locally around 14.3.

With no other changes but the Green filter, I pulled better numbers.

One comment, this truck ALWAYS pulled the filter minder a little. Never much, but always a good amount if I get in the boost.

With the Green filter, I did a couple 35+ psi pulls, a few full throttle runs, and many 3/4 gauge pulls along the route and when I got home today I checked the filter minder and it hasn't moved.

IMO this filter is certainly significantly less restriction. I will pull it and look in the tube tomorrow for any dust in the tube, but at this point, I really like this filter. On this run this weekend, it saved me over 20 bones in fuel cost, not a lot but that was only 1000 miles total, 4 runs like that it pays for itself.

(FYI, first trip in the rain got the same results, but I lost one fuel slip so I couldn't be precise, so I decided not to report on that one, it was nearly identical, but one leg was in the high 18's because I wasn't running the air and it was 2 AM so we were running a little slower)

Last edited by My427stang; 05-11-2009 at 02:15 AM.
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post #2 of 10 (permalink) Old 05-11-2009, 03:33 AM
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awesome thank you for the update is this filter oiled or dry filter?
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post #3 of 10 (permalink) Old 05-11-2009, 03:47 AM
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and let me just take a shot in the dark and say .... 3.73s? good mileage!

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post #4 of 10 (permalink) Old 05-11-2009, 03:54 AM Thread Starter
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3.73's, AT, and it is an oiled filter.
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post #5 of 10 (permalink) Old 05-11-2009, 03:11 PM
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Thanks for the detailed MPG report. We need more forum members to post in this manner then maybe the questions about better fuel economy will stop.

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post #6 of 10 (permalink) Old 05-12-2009, 02:22 AM
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are you going to try the 210 tune? for mileage difference.
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post #7 of 10 (permalink) Old 05-12-2009, 04:02 AM
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Thanks for the detailed MPG report. We need more forum members to post in this manner then maybe the questions about better fuel economy will stop.
I posted the results for a 2500mile trip in the tuner section because I was running the Spartan 210.

https://www.thedieselgarage.com/forum...ad.php?t=74959

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post #8 of 10 (permalink) Old 05-12-2009, 11:41 AM Thread Starter
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are you going to try the 210 tune? for mileage difference.
I have to make the same run at the end of the month. I hadn't thought about it, but I will put the 210 in.

Although the 75 hp program isn't the fastest in the room, I have sure grown to like it, so its hard to take it out

However, having the extra power on the run will be fun too. I'll do it and post June 2nd.
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post #9 of 10 (permalink) Old 05-12-2009, 11:43 AM Thread Starter
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I posted the results for a 2500mile trip in the tuner section because I was running the Spartan 210.

https://www.thedieselgarage.com/forum...ad.php?t=74959
Battle cattle, your write up was good, one of the reasons I did this one.
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post #10 of 10 (permalink) Old 05-12-2009, 02:48 PM
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Originally Posted by My427stang View Post
Battle cattle, your write up was good, one of the reasons I did this one.
We must get more people to do it!!

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