Thirsty Renault

Price of fuel has no bearing when he/she's talking about the range they're getting for a full tank though.

I think it's about 50 litres in the OPs car, which if it is the case, is pretty poor consumption, but then again it could be all city driving which would affect it adversely.

Again, a full tank is a full tank, doesn't matter how much it cost to fill it when it comes to consumption.

How many litres of fuel is it using for 400km? Looks like Captur is either 45 or 50 litre tank, some people will refuel when low fuel light comes on which would leave 5-7 litres left, others will leave until trip computer says 5km, so difficult to calculate actual mpg unless the number of litres actually used for the trips is known. If it's urban/city driving anything around 30mpg would be normal for an automatic non-hybrid petrol car of that size.

For 400km:

50 litres use would be 22/23mpg

45 litres use would be 25/26mpg

40 litres use would be 28/29mpg

35 litres use would be 32/33mpg

30 litres use would be 37/38mpg

A faulty oxygen sensor or clogged air filter could cause the engine to run rich (i.e. burn too much fuel). Did the dealer run the diagnostics for you or use a probe in the exhaust to check the exhaust gases?

banjaxed Oxygen sensor, has to be at that sort of consumption.

no, but diagnosis is the issue.

19l/100km is around 18mpg, a 2 year old captur should be up around 45mpg.

I would be back to renault and say that there is a problem with the consumption, you have checked it and its only getting around 18 mpg. Obviously there is a problem and as its under warranty, they have to fix it.

you can book a diagnosis with any renault dealer. Just tell them that the previous guys refused to do it. linky here: https://www.renault.ie/contact/book-a-service.html

Where in the country are you based? Might be a problem if you only have one dealer where you are based.

No, those places are only for tyres.

each car company has its own diagnostic software, so it can be difficult for an independent garage to even look at the problem.

Keep recording the MPG. Get an app so you can show them the consumption and it is accurate. don't just rely on the car one.

fuelio is the one I use.

Fill it to the neck.

Write down the km reading on a piece of paper.

Drive on for 200-300 kms then fill it to the neck again.

Write down the km reading again and subtract the previous reading.

Divide that by the number of litres in the second fill.

That is your true km/l.

Delete

Yeah it’s pretty crap, I’ve driven from Dublin to Kerry in it a few times doing 120kmh and you’d only get 7l/100kms. It’s nippy and rather enjoyable in sports mode tho and far nicer than listening and smelling a crappy diesel!

True Mpg on previous model petrol Captur is around mid 30s according to Honest John.

Renault figures gave them as high as low 50s.

You dont need to go to a renault garage for your service . The warranty will be valid as long as your car is serviced as per schedule & parts of a similar or higher quality are used.

If you know a good garage you could take it there to have it checked out. Obviously to have something repaired under warranty you'll need to go back to renault.

That might be true in theory, but the OP's car has a known problem, and is within warranty. Going to an independent is just asking for trouble.

Renault would be well within their rights to ask the OP to prove that the indy garage followed Renault service procedures to letter, which I seriously doubt that they'd be willing or able to do.

7.5l/100km around the city is totally expected, it's 37mpg in old money. Good going for stop/start traffic.

"how do you know the independent didn't damage the car in the process of diagnosing the fault?"

This is what the dealer will say to get out of a warranty claim. Stick with main dealer while there is a warranty. Afterwards go to who you like.

But you did specifically say servicing. An external diagnosis is a different proposal alright.

How exactly have I advised the op to invalidate his warranty?

The law is pretty clear that a warranty is not invalidated by getting you car serviced at an independent, even if you don't believe it.

Anyway I just wanted to point out to the op that he has other options since the main dealer is denying any fault.

In my experience, different dealers will charge varying amounts for what looks like the same work.

27k is a very high price to pay for a used Captur. Anyway, that's not the problem. Is yours the 90bhp TCE engine? That's a three cylinder unit. These are revvy engines by nature so consume more fuel. Cars with automatic transmissions consume more fuel than manuals. If the problem was a faulty o2 sensor a warning light would illuminate on the dash. The "Eco" mode should only ever be used when driving in town and in heavy, slow moving traffic when you are stopping and starting a lot. The diesel model would have been a far wiser purchase.

Yeah I wasn’t expecting excellent mpg when I bought the puma, I changed from a diesel focus as that wasn’t much better mpg as we do nearly all city driving and do an average of around 15/20kph. It’s very nippy and super quiet and smooth so we are very happy with it. I’m not sure there is anything wrong with the ops car to be honest, an auto petrol is always gonna be a bit thirsty

Are you keeping a log of the number of litres to fill it each time - this seems to be missing in your commentary, maybe you still have the fuel receipts?

If the car needs a service then ring around all the main dealers as prices do vary but tell them your booking it in primarily for a warranty job to fix the poor fuel economy - otherwise you might find they dont have time booked with the one mechanic that can work out what's wrong. Dont dream of going outside the main dealers with such a new car.