blackvelvet Posted February 9, 2017 Report Share Posted February 9, 2017 My trip computer 2006 Voyager 2.8 diesel tells me I am getting 35 MPG. In reality, I am only getting 22 MPG, and I drive carefully. Any ideas. Quote Link to comment Share on other sites More sharing options...
0 Woodie106 Posted February 9, 2017 Report Share Posted February 9, 2017 Don't believe everything you read......... ametcalfe1989 1 Quote Link to comment Share on other sites More sharing options...
0 bignev Posted February 9, 2017 Report Share Posted February 9, 2017 Yeah it's a lying toad,Like the one on my old 2007 Galaxy that said 52mpg...... 420 miles on 45.5 litres - 10 gallons - = 42mpg.Not too far out hey!!!!!!!!!My "new" also 2007 Galaxy Ghia is much more accurate, only reckons 46 instead of 41. At least the one on my 3.3 petrol doesn't care that it's pooe, it just tells you it's only 16 round town. Which is sadly right. But it's on gas. Anyway other than that, check you have a clean air filter, treat it to some form of injector cleaner, a fuel filter, and if it's not had one recently treat it to some fresh engine oil instead of the black syrup it will be trying to run round in.Check tyre pressures - they are heavy cars and this makes a ig difference.And put it in neutral and try pushing it to check the brakes aren't binding a little. Quote Link to comment Share on other sites More sharing options...
0 blackvelvet Posted February 10, 2017 Author Report Share Posted February 10, 2017 Thanks bignevI havn't had it long and I aint had a chance to service it. I just downloaded the workshop manual, so I will get it done and see if it makes a difference.Just a shock to the system to think 35 miles a gallon and realise it's onlly 22. MPG. Quote Link to comment Share on other sites More sharing options...
0 Stevec0268 Posted February 10, 2017 Report Share Posted February 10, 2017 Also remember that it measures in US gallons. Still a long way out though. Quote Link to comment Share on other sites More sharing options...
0 blackvelvet Posted February 10, 2017 Author Report Share Posted February 10, 2017 SteveRemember if it is USA gallons the reading is even worse.A US gallon is less than ours, so I would have to add a percentage to my reading.The 35 would be nearer 42, and in reality I still only get 22. Quote Link to comment Share on other sites More sharing options...
0 QinteQ Posted February 10, 2017 Report Share Posted February 10, 2017 (edited) Get on a 10/20/30 mile long 50MPH road with no roundabouts. Reset the trip and get the real time readout @ 50MPH. Turn around and do the same reset, same distance @ 70MPH what do you get. MY 2.8 gets 33.9 average up hill down dale in the summer and 2 MPG less in the winter. Everyone will lose a couple of MPG in the cold weather - its normal. Just keeping a 2.8 engine running in ASDA car park or a traffic jam for 10 minutes on tickover will sink your average [ing] MPG. If you only do town work and school runs then 22MPG would be about right. [Edit] You can : Mini-Trip Computer • Average Fuel Economy (ECO AVG) Shows the average fuel economy since the last reset.• Distance To Empty (DTE) Shows the estimated distance that can be travelled with the fuel remaining in the tank. This estimated distance is determined using the MPG for the last few minutes.• Trip Odometer (ODO) Shows the distance travelled since the last reset.• Elapsed Time (ET) Shows the accumulated ignition ON time since the last reset.• Off Mode Shows a blank display. You should also have [year dependant] : • US/M Button Press this button to convert the display from U.S. to metric. Best of luck. Edited February 10, 2017 by QinteQ Quote Link to comment Share on other sites More sharing options...
0 blackvelvet Posted February 10, 2017 Author Report Share Posted February 10, 2017 HiQuinteQThats what we did to get the correct mileage. We averaged 22MPG. The tank was filled and the trip gauge zeroed, and the trip meter zeroed.Drove the car really carefully. I expected the reading to be incorrect, but the amout staggered me.I also live in Wales at halfway up a mountain so realistically we have to expect low MPG, but the gauge read 35 MPG.I think my complaint is the trip computer is so wrong, not the MPG I get. Quote Link to comment Share on other sites More sharing options...
0 QinteQ Posted February 11, 2017 Report Share Posted February 11, 2017 Look the UK + UK foot is the same @ 5,280 international feet. The only difference can be rotational tyre size, binding brakes etc or you do have a-n-other problem. If your mileage readout is wrong it will be the first ever such finding I've ever heard of though I suppose there's always a first time for everything. Quote Link to comment Share on other sites More sharing options...
0 blackvelvet Posted February 11, 2017 Author Report Share Posted February 11, 2017 QuintqVery interesting comment, can I take it that nobody else has the same problem.I dont doubt for a moment that something may be at fault to cause such abysmal mileage. Why would the trip computer read 35 MPG when a road test with a full tank shows the correct mileage is only 22 MPG?Is this a rare fault and can anyone tell me how the computer can get it so wrong? As far as I can tell everything else on the computer appears to be correct. Quote Link to comment Share on other sites More sharing options...
0 QinteQ Posted February 11, 2017 Report Share Posted February 11, 2017 No idea M8, as I said it's a 1st for me. I've got a full scanner and can't ever REM seeing any way anyone even with a powerful diagnostic can change this area of coding. I can certainly see why returning up just 1 big hill will knock hell out of an average but the puter should always be about right - not that far out. Quote Link to comment Share on other sites More sharing options...
0 blackvelvet Posted February 12, 2017 Author Report Share Posted February 12, 2017 Hi guys did the diesel test again as quintq recommended, today, Sun.Trip computer said 34 MPG topped the tank up after a run, actual 19 MPG.I don't have an issue with the MPG I would like better obviously, but the trip computer is so far off it amazing. Quote Link to comment Share on other sites More sharing options...
0 bignev Posted February 13, 2017 Report Share Posted February 13, 2017 Yep bizarre, just like our old galaxy, no ideas at all why though........... Quote Link to comment Share on other sites More sharing options...
0 blackvelvet Posted February 13, 2017 Author Report Share Posted February 13, 2017 Filled the tank Sunday, drove like a tw#t, stopped started often while the old ball and chain did her running.Filled it monday 24 MPG. gauge was still way off the mark, but I got 2 MPG more while not being very light footed.There must be a moral.Phoned a main dealer, they never heard of such a problem. Quote Link to comment Share on other sites More sharing options...
0 Woodie106 Posted February 16, 2017 Report Share Posted February 16, 2017 I do mainly town driving / school runs & i average about 23 mpg which is what my comp says. Mate of mine has a disco & he does a spread sheet on his fuel consumption & how much per litre it is ay various filling stations & enjoys telling me how he averaged 34.7782 mpg on a run from some place to another. I just tell him lifes too short & how when i see the fuel gauge is low i put some in & drive it. Quote Link to comment Share on other sites More sharing options...
0 QinteQ Posted February 16, 2017 Report Share Posted February 16, 2017 Its a 2 1/2 ton - 3 litre mota, the most expensive cost is your right foot. Town work is always gonna be ± 25. Out of town I'm light of foot and live in 'cruise' mode which will save me 1,000RPM in any gear @ any speed. The 41TE has a permanently running software adjustment that will recognise and give you what you want, heavy clog drivers gets lotsa REV's light footers better mileage lower RPM. Quote Link to comment Share on other sites More sharing options...
0 blackvelvet Posted February 16, 2017 Author Report Share Posted February 16, 2017 My main consideration was the trip computer readout. It reads 35 MPG and in reality I was getting 22MPG,I have 2 Cadillacs one at 7.5 litre and one at 8 litre.Driving with a light foot is obligatory for me and my wife.I dont think 22 MPG is bad if you consider I live in the Welsh mountains, and most of the local roads are narrow.I just don't understand the trip computer readout. QinteQ 1 Quote Link to comment Share on other sites More sharing options...
0 blackvelvet Posted February 18, 2017 Author Report Share Posted February 18, 2017 Amazing trip computer showed 31 MPG in reality 26 MPG none of it adds up. Quote Link to comment Share on other sites More sharing options...
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blackvelvet
My trip computer 2006 Voyager 2.8 diesel tells me I am getting 35 MPG. In reality, I am only getting 22 MPG, and I drive carefully. Any ideas.
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