Marcel67 Posted July 24, 2014 Share Posted July 24, 2014 I have 2010 model Volvo 670 cummins isx engine in my fleet and have an issue with the fuel consumption. The inboard computer tells me that the truck is doing 6.7 mpg, and tell me 400 gallons used, however if I get the fuel receipts I'm between 70 to 160 gallons more used the driver claims. I don't like to shout they steeling fuel unless I have the proof. Is there a fuel manage device available that could be installed on the truck that collects data to compare. I have calculated the miles driven divided by gallons used and get 5.9 miles per gallon. This is happening on two truck in a fleet of 22. Any advice would be great to resolve this mystery. Next week we will start using our new fuel cards, so I hope that gives me more control and instant data since the drive has to put mileage before pumping. Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/ Share on other sites More sharing options...
farmer52 Posted July 24, 2014 Share Posted July 24, 2014 Run a Technology and Maintenance Council (TMC) Type IV fuel economy test Recommended Practice (RP) 1109B.Have you tried a locking fuel cap and controlled refueling? Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-253872 Share on other sites More sharing options...
Marcel67 Posted July 25, 2014 Author Share Posted July 25, 2014 Ken thanks I'm gong to order locking fuel caps and anti syphon so the can not stick any in the tank. Also I'm looking to install Qualcomm fleet manager on my trucks. Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-253928 Share on other sites More sharing options...
shokwave30 Posted July 30, 2014 Share Posted July 30, 2014 Dont go off the trucks computer it can be off. Try an app called fuel guages. Its affiliated with lets truck.com u jyst have to fill in the info and it will give u fill up to fill up 30,60,90, lifetime fuel avg's Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254521 Share on other sites More sharing options...
Gmerrill0516 Posted July 30, 2014 Share Posted July 30, 2014 I'm not largely experienced with many vehicles but have never seen the onboard mileage calculations be correct. I think it is possible that they can be but I've never seen it. That's not much help I guess but when in doubt lock the fuel up and check it manually for a while. You can "calibrate" the readings against actual measurement and determine a multiplier to correct what the computer says if indeed it is off...Good luck. Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254522 Share on other sites More sharing options...
mack mhe9 Posted July 30, 2014 Share Posted July 30, 2014 I agree with Shokwave. Lets truck .com has a great fuel tracking system. He also offers a scan gauge for real time tracking and fuel saving ideas. Kevin Rutherford, he's big into helping owner operators. Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254525 Share on other sites More sharing options...
rsb502 Posted July 31, 2014 Share Posted July 31, 2014 A 2010 getting almost 6 mpg on the dash dpesnt sound too far off to me, id see what you get off the new fuel cards and go from there if it was me. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254531 Share on other sites More sharing options...
Superdog Posted July 31, 2014 Share Posted July 31, 2014 Best advice I can think of is get rid of the Volvos. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254546 Share on other sites More sharing options...
terry Posted August 1, 2014 Share Posted August 1, 2014 Best advice I can think of is get rid of the Volvos. Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254671 Share on other sites More sharing options...
slpwlker Posted August 1, 2014 Share Posted August 1, 2014 I use trip log gps just the fuel log side. Free app for any android based and I think apple phone. add it in everytime and keep up to date info per fuel Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254676 Share on other sites More sharing options...
Freightrain Posted August 1, 2014 Share Posted August 1, 2014 The computer is off about 1/2 gal/mile. Not huge in my eyes(for a onboard type system), but when you are talking about such a large fuel capacity on a vehicle it can add up quickly for "missing gallons". Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254680 Share on other sites More sharing options...
Gmerrill0516 Posted August 1, 2014 Share Posted August 1, 2014 .5 mpg/6 mpg x100% = 8.3% error...not great but not out of this world.. Is the error consistent from tank to tank? If it is then you can fudge it out of the calculation. If not...punt. Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254686 Share on other sites More sharing options...
Marcel67 Posted August 2, 2014 Author Share Posted August 2, 2014 Thanks guys, I got the Comdata Fuel cards now and all drivers have to impute truck nr and mileage when fuel up . So now I can track it thru actual fuel pumped, calculating the miles thru the advised apps. In a meeting with all our drivers I told them that high fuel consumption can cost big money to the company so implemented a fuel challenge who can get the best fuel mileage. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-254718 Share on other sites More sharing options...
bobgil Posted August 5, 2014 Share Posted August 5, 2014 I was until 4 weeks ago driving a 2012 T 800KW with the cummins in it and the fuel thing in the dash was close moste of the time unless I idled every much or ran the on board APu. I put all of my fuel up into the fuel gauges and the average would vary from the in dash computer some but not a drastic amount.Bob Quote Bob Gil If it an't a Mack could it really be a truck??? Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-255105 Share on other sites More sharing options...
Brandt Posted August 6, 2014 Share Posted August 6, 2014 (edited) My DD Series 60 says I am getting 7.46 mpg. If I put pencil to paper I am getting 6.78. I'm gonna try fuel gauges on Lets Truck, but don't believe your ECM. My IFTA report is more accurate. Edited August 6, 2014 by Brandt Quote Link to comment https://www.bigmacktrucks.com/topic/36447-fuel-consumption/#findComment-255205 Share on other sites More sharing options...
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