Bad economy on 1.6 CRDi

cleid · **December 25, 2015, 17:34:41**

Hi all,

We picked up a GD i30 Tourer 1.6 CRDi auto with about 42K km on the clock last week. Have driven it around town a few times and the numbers from the onboard computer are scaring me, it is showing ~12 l/100 fuel consumption! This was while carrying passengers only, and I am a sedate driver.

What could be wrong? Is this even possible for a diesel this size?

Dazzler · **Reply #1: December 25, 2015, 21:11:09**

Does it seem to drive ok and sound ok? It is quite possible the trip computer is just confused for some reason.

The best way to check if fill with premium diesel (easier to brim the tank as less frothing) then take note of the mileage. Drive around for a few days (the longer the better) then fill up to the brim again and do the calculations.

Shouldn't be worse than 7 or 7.5 I would imagine?

EmpiriuS88 · **Reply #2: December 25, 2015, 22:02:09**

It's strange indeed. When I bought mine at 20.000 The fuel consumption average was 11l. But I haven't got mine higher than 5.6l. But going pedal to the metal will get you to 7 if not more in city.

By the way. I noticed driving in 2nd 30km/h the current consumption gauge shows allmost 20l current, while drinving 35 in 3rd goes to 12l max.
Don't floor it, and test out what the consumption meter shows in different gears with simmilar speeds and you should be aroun 5-5.6l on highway and around 4l out of the citiy and around 7l in the city. It depends on the driving style as well as traffic.
Remmeber, racing is not fuel efficient

cleid · **Reply #3: December 25, 2015, 22:32:27**

Thanks all for the replies.

The car runs great and sounds normal to me. We also had a pre-purchase inspection done which didn't pick up any serious issues, only a "minor seepage at top of engine area" and (significant) uneven tyre wear on what is now a rear tyre (20% tread left as opposed to 70% on the opposite side).

I just went out and disconnected the negative battery terminal, will reconnect later on and go for a drive to see if that sets the trip computer straight. I will also check tyre pressures, which I haven't done yet. Otherwise, will do as per Dazzler's suggestion and go "old school" on measuring consumption.

Phil №❶ · **Reply #4: December 26, 2015, 01:00:28**

Remember the diesel doesn't need to go above 3k rpm and ours doesn't go much above 2.5k rpm driving normally (we own an auto). They are different to drive than a petrol engined vehicle. We usually get about 5.7 on average depending on the mix of driving.

Are you doing decent sized trips when driving. Lots of small trips on cold motor will use more juice.

It would help if we knew what country you're in, the trans type and year of vehicle.

If it has a DPF you may have caught it doing a cleanong cycle. If so the economy does drop significantly but only while regenerating.

Just Rick · **Reply #5: December 26, 2015, 01:27:05**

If I have said it once I've said it thousand times, the Hyundai fuel consumption computers are crap,most useless piece of equipment on the cars,I still work my consumption manually,just guessing but yours being a wagon and a auto I would expect you would get about 7/100.

And welcome to the club

cleid · **Reply #6: December 26, 2015, 04:53:01**

Phil, it's a 2013 auto 1.6 CRDi.

The ECU reset seemed to help, I did a short trip afterwards and consumption was around 8L /100km. Not amazing but at least it's single digits. It is now creeping back up due to start/stop traffic but I have a longer trip planned tomorrow so will see how I go.

Dazzler · **Reply #7: December 26, 2015, 06:09:27**

It is only indicative, not that accurate

beerman · **Reply #8: December 26, 2015, 06:19:14**

Stop start is the enemy of economy. I hate doing stop/start as it always ruins my economy.....

Reset the trip meter and go for a nice long highway drive. See what she reads.

It is very hard to compare driving styles. My wife would say she is a 'sedate driver' but her idea and mine are vastly different (and funnily enough so are our fuel economy figures).

PhireSideZA · **Reply #9: December 26, 2015, 08:39:02**

Sounds like your DPF is regenerating to me. Go for a nice long 45+min drive and see if it improves

Dazzler · **Reply #10: December 26, 2015, 08:51:37**

I think this member is in Australia, so no DPF!

PhireSideZA · **Reply #11: December 26, 2015, 08:56:01**

Quote from: Dazzler on December 26, 2015, 08:51:37

I think this member is in Australia, so no DPF!

Oops, I didn't know your market had the deleted DPF vehicles. Lucky you!

Hopefully the ECU reset does the trick. That is pretty heavy consumption for a diesel, my 1.6 petrol with 200K km on the odo as an example gets about 12 - 14km/l on average so yours should be markedly better.

Has the car been serviced regularly and are your tyre pressures etc. all good?

MarkC · **Reply #12: December 26, 2015, 09:36:28**

You won't get good fuel economy until the engine reaches normal operating temp. My daily commute consists of 4 miles of motorway driving and two of busy dual carriageway - which gives me an average of 44mpg. Sat in traffic, its scary how the MPG drops by the minute, especially in the winter. On the other side of th coin, a nice drive out at the weekend can easily return 66mpg so long as I keep the speed around 65mph and avoid queues.

cleid · **Reply #13: December 27, 2015, 09:45:34**

Filled up with BP Ultimate today and went for a 210km drive to the Blue Mountains and back, mostly highway. Fuel consumption dropped to 6.1 L/100 according to the trip computer. Tyre pressure 34 psi.

I will update this thread with the real usage once I fill up again (might be in a fortnight as I'm going to be away for a while).

Phil №❶ · **Reply #14: December 27, 2015, 10:25:07**

We run 36 psi in our car. Last long trip we got 5.5 l/100k @ 110 kmh.

MarkC · **Reply #15: December 27, 2015, 18:53:56**

Quote from: Phil №❶ on December 27, 2015, 10:25:07

We run 36 psi in our car. Last long trip we got 5.5 l/100k @ 110 kmh.

Thats interesting - 32psi is the book pressure for mine, I might have a go at the higher pressure and see if it returns better results...

Dazzler · **Reply #16: December 27, 2015, 21:56:40**

Quote from: MarkC on December 27, 2015, 18:53:56

Quote from: Phil №❶ on December 27, 2015, 10:25:07
We run 36 psi in our car. Last long trip we got 5.5 l/100k @ 110 kmh.

Thats interesting - 32psi is the book pressure for mine, I might have a go at the higher pressure and see if it returns better results...

Less rolling resistance at higher pressures. 36 PSI is a fairly good compromise V ride and economy...

Phil №❶ · **Reply #17: December 27, 2015, 22:11:30**

The book figure is a comfort setting and not particularly efficient. Our tyre specialist member "Surferdude" advises that 36 is quite satisfactory for these cars. Many members are running similar pressures.

MarkC · **Reply #18: December 27, 2015, 22:32:40**

Well thats good enough for me! If the rains stop tomorrow, i'll divert some of the air from the boat to me tyres...

Freak187 · **Reply #19: January 08, 2016, 08:02:37**

I've managed to get 4,5L/100KM doing 130 km/u in France with a fully loaded car (2013 I30 1.6 CRDI). Was really pleased with that.

Normal daily commuting around Amsterdam (45 KM one-way trip doing average 90 km/u) gets me an average of 4,8 - 5,0L / 100KM.
When there is heavy traffic, the average goes up but that's logical of course.

By the way, the ECU seems to get the fuel consumption pretty accurate. I have compared it with the actual fuel uplift and actual distance, and it was pretty spot on.

liability · **Reply #20: January 08, 2016, 08:15:37**

Quote from: Freak187 on January 08, 2016, 08:02:37

By the way, the ECU seems to get the fuel consumption pretty accurate. I have compared it with the actual fuel uplift and actual distance, and it was pretty spot on.

I have found that in my one month old CRDi DCT auto that the actual fuel consumption is lower than the displayed fuel consumption. On my last two tank fulls (filled to the brim each time) I got 4.8l/100kms and 4.9l/100oms, while the displayed consumption was 5 and 5.1, respectively.

XinZhao · **Reply #21: January 24, 2016, 17:57:24**

My display consumption is about 0.4 L/100km lower then the actual consumption. But recently I measured the odometer accuracy - the display shows 3% less mileage compared to the actual mileage.
When I recalculate it, it stands that the display shows cca 0.25 L/actuall100km
So, when it says 5.5, it is actually 5.75 L/100km

AlanHo · **Reply #22: January 24, 2016, 18:57:55**

Quote from: Dazzler on December 26, 2015, 08:51:37

I think this member is in Australia, so no DPF!

I was under the impression that the tourer for Australia was sourced from Europe.

In which case there may well be a DPF fitted.

But I have been known to be wrong - ask the wife......

cleid · **Reply #23: January 24, 2016, 20:44:41**

It is indeed built in the Czech Republic but does not come with a DPF installed.

I calculated 6.4L/100 from my last tank, which included a 500km trip. The computer showed 6.8L/100. Right now it is showing 5.5 with only highway driving at 100kph which is a bit higher than I would have hoped even for an auto but not as bad as the initial figures.

Dazzler · **Reply #24: January 24, 2016, 21:02:55**

Quote from: cleid on January 24, 2016, 20:44:41

It is indeed built in the Czech Republic but does not come with a DPF installed.

I calculated 6.4L/100 from my last tank, which included a 500km trip. The computer showed 6.8L/100. Right now it is showing 5.5 with only highway driving at 100kph which is a bit higher than I would have hoped even for an auto but not as bad as the initial figures.

The new 7 speed DCT model is apparently quite a bit better fuel economy wise, but they are scarce as hen's teeth here in Oz!

Doggie 1 · **Reply #25: January 24, 2016, 23:28:38**

Quote from: Dazzler on January 24, 2016, 21:02:55

Quote from: cleid on January 24, 2016, 20:44:41
It is indeed built in the Czech Republic but does not come with a DPF installed.

I calculated 6.4L/100 from my last tank, which included a 500km trip. The computer showed 6.8L/100. Right now it is showing 5.5 with only highway driving at 100kph which is a bit higher than I would have hoped even for an auto but not as bad as the initial figures.

The new 7 speed DCT model is apparently quite a bit better fuel economy wise, but they are scarce as hen's teeth here in Oz!

You're not looking in the right places, Dazz.

Dazzler · **Reply #26: January 25, 2016, 07:17:22**

I should clarify that, The tourer, particularly the Elite Tourer Diesel..

cleid · **Reply #27: January 31, 2016, 21:24:56**

Did a long highway trip on the long weekend with cruise control on 110/100kph. The trip computer showed 5.5L/100 and subsequent calculations came in at 5.1, which is close enough to Hyundai's claim of 4.7 for the auto to make me happy.

Since then I've inflated the tires from 34 to 36psi, am curious to see what difference that makes if any.

Asterix · **Reply #28: February 01, 2016, 18:00:42**

Quote from: cleid on December 25, 2015, 17:34:41

it is showing ~12 l/100 fuel consumption!

Quote from: cleid on January 31, 2016, 21:24:56

The trip computer showed 5.5L/100 and subsequent calculations came in at 5.1, which is close enough to Hyundai's claim of 4.7 for the auto to make me happy.

Well, it sure have improved...

GDTourer · **Reply #29: March 08, 2016, 06:39:04**

Some weeks ago, I had a curious but similar issue with my 2013 GD Tourer CRDi Manual.

Usually when I fill up, the Distance to Empty is around 830km - I average between 5.1 - 5.3 l/100km.

However after I filled up a few weeks ago, the Distance To Empty only showed 700km, and once driving it was going down very quickly - a lot quicker than usual.

I ended up disconnecting the battery for a few minutes, re-connected and hello - working as new again!