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MPG. is rubbish!

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Johno.0
jmee54
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MPG. is rubbish! Empty MPG. is rubbish!

Post by jmee54 Wed 6 May 2020 - 14:02

Hi all,
My 1.2 seems to be averaging 35mpg now. I am sure it was around 40 when I bought it, which in my mind is pretty rubbish, so 35 is the same as I get from my motorhome.

Is there anything I should be looking at to improve this abysmal fuel economy? Are there any modifications I can do to improve it?

jmee54
Took the roof down

Posts : 43
Join date : 2019-04-03
Location : Cornwall

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Post by Johno.0 Thu 7 May 2020 - 0:10

I had a judder when pulling away in first gear which I haven’t had for what seems to be ages now! However, because of this I went through the ignition system replacing everything, then fuel line, etc... and the other day I got just over 40 on mpg, (1.2 here as well). Not entirely sure what I replaced might have affected the fuel economy, maybe it all did but it could be worth looking there? I’ve noticed better fuel economy for a few days now, and I’m a very enthusiastic driver. 😅😅
Johno.0
Johno.0
The Wind in your hair

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Post by 'Old'SeaDog Thu 7 May 2020 - 9:45

Getting 45.3mpg....according to the read-out anyway....
Mine's a 1.2 as well, so 35mpg is seriously low. Have you had it serviced recently?
'Old'SeaDog
'Old'SeaDog
The Wind in your hair

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Post by pittstop Thu 7 May 2020 - 10:25

An average of mixed driving for my 1.6 is about 34mpg which I find reasonable considering the low overall gearing & the close ratio gearbox. Let's face it the 133 1.6 engine was good in it's day re performance but it is pretty long in the tooth re fuel efficiency.

BUT: The 1.2 was Renault's early move into efficient tiny turbos so; unless you are really pushing it 35 mpg does seem poor.

The suggestion of checking out the ignition system is a good one. I noticed a difference on mine after changing plugs & coil packs. Renault recommend plug changes at 36000mls but no time limit unlike say the air filter recommendation which is 54000 mls or 4 yrs. Personally I change my air filter much more often which could be another area for you to look at.Hope you work it out.
pittstop
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Post by Johno.0 Thu 7 May 2020 - 12:38

I change my air filter every 3000 miles, I’d never leave it that long. I suppose that’s good in a way though as it means things are built to last longer... I hope.
Johno.0
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Post by pittstop Thu 7 May 2020 - 16:21

Is that 3000 or 30000miles?

If it's 3000 it takes me back to my MGBs when I had to get out the grease gun on the suspension & steering every 2500 mls!
pittstop
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Post by jmee54 Sat 9 May 2020 - 23:03

The service light has just come on and the car was serviced a year ago when I bought it. 45mpg would be great. To be honest, apart from the odd rush of blood, Cornish lanes are not too conducive to over spirited driving - tractors joggers and horses have caused brown trouser moments several times, so it would seem that something needs looking into. Should I just start replacing parts as mentioned above (Johno.0) and hope for the best (can I reset the service light?) or do I need to get it plugged into some technology? Difficult under the present circumstances.

jmee54
Took the roof down

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Post by Johno.0 Sat 9 May 2020 - 23:29

This is the link for the service light reset: https://youtu.be/85t6kpuEw_M
I tend to service the car myself as I don’t always trust that a full service means a full service if you know what I mean.
I’ll only take it to a garage if I am unable to do it myself, like engine removal or new clutch, etc... I would have thought you’d see an increase after a service. I always “splash out” on new parts for my car as I do think you get what you pay for! Let us know how you get on.
Johno.0
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Post by pittstop Sun 10 May 2020 - 10:28

@Johno.0 wrote:This is the link for the service light reset: https://youtu.be/85t6kpuEw_M
I tend to service the car myself as I don’t always trust that a full service means a full service if you know what I mean.
I’ll only take it to a garage if I am unable to do it myself, like engine removal or new clutch, etc... I would have thought you’d see an increase after a service. I always “splash out” on new parts for my car as I do think you get what you pay for! Let us know how you get on.
Johno:  I identify with that. I also do everything I can on the driveway myself. 
Some garage's description of a "full service" can be debatable to say the least.


Re Jamee's driving conditions: Even though you aren't going very fast I guess you must spend a lot of time in the lower gears which can impact significantly on your mpg.
pittstop
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Post by DarrenJ Sun 10 May 2020 - 12:11

In terms of MPG have you checked tyre pressures as they are often forgotten about and can have big impact. Also with the good weather has it been a lot of driving with roof/windows down and air con on? All the little things can add up alongside a proper service to change fluids, filters, plugs etc
DarrenJ
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Post by knebby Tue 12 May 2020 - 6:54

My mpg is always around 42 for the 1.2 and around 36 for the 1.6, same roads, same speeds etc, so around 17% higher for the 1.2.
knebby
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Post by jmee54 Tue 12 May 2020 - 19:14

Oil filter, oil, air filter. What else would you change in my position? Plugs. coil pack?

jmee54
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Post by jmee54 Tue 12 May 2020 - 19:17

PS. I have been driving with the roof down over the last few weeks, but only down to the beach 40mph max and the mpg has been 35 for some months now - with same sort of driving. I will give the tyres a check too.

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