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Old 21st February 2021, 17:22   #1
Ravinder
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Default 75 diesel auto fuel consumption

Iím getting on around 36-37 mpg on my 75 diesel cdti 135hp auto. This is a mixture of driving on various roads. Is this about normal? What can I do to improve this? Thanks.
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Last edited by Ravinder; 21st February 2021 at 19:23..
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Old 21st February 2021, 18:00   #2
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Pretty normal in the winter months - mine improve to over 40mpg in the summer, and considerably more (48+) on longer journeys and with cruise.
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Old 21st February 2021, 18:02   #3
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sounds about right mate that's roughly what we get from my dad's one. Only get up to around mid 40's if the majority of the journey is a long distance motorway run.
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Old 21st February 2021, 19:16   #4
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Great, thanks. When I filled it up last time, I was getting about 38 mpg and that was mainly motorway driving which I thought was quite disappointing. I was hoping for at least 40 mpg.
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This vehicle was the 50,481st 75 to run off the production line, out of 112,381
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Old 21st February 2021, 19:53   #5
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My last auto would quite easily average 50mpg on a motorway run, well over 600 miles to a tank then mixed driving it was around 40. It was better than my current manual tourer. Maybe time to pay one of the t4íers to see how things are running, maf, could be out of spec, maybe an injector is past itís best?
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Old 21st February 2021, 20:20   #6
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Even injector cleaner might help if you have a poor spray pattern on one or more injectors.---
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Old 21st February 2021, 20:29   #7
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40 mpg on the auto. Never wavered in the time I've owned it, I'm quite happy with that usage it being an auto diesel.
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Old 21st February 2021, 21:02   #8
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Quote:
Originally Posted by Ravinder View Post
I’m getting on around 36-37 mpg on my 75 diesel cdti 135hp auto. This is a mixture of driving on various roads. Is this about normal? What can I do to improve this? Thanks.
This is a how long is a piece of string type question, as driving style roads and traffic will all play a factor, and make it incomparable with mine, or someone elses's.

Mine does 32-36 mpg consistently for my commute, depending on temperature. Pre lockdown, my driving was rarely different, and the figures were more or less bang on month in month out. My commute is 1 mile around town, then 1 mile at 40, 2 miles at 50, 2 at 40 again and then 3 at 70 (accelerating to 70, normally from a stop or near stop) and a final 1 at 50. Total is around 10 miles. On the way home it is different, and less economy friendly as I stop at my fathers half way home. Since doing that, I noticed a drop of around 2 or 3 mpg. But then, if I was to do 10 miles at 70 it will do around 45-50mpg. Driving at 55 perhaps around 55 mpg.

Since lockdown, it is around 30 or 32! But then, I am going to the shops and back, and I think my longest journey has been 7 miles.

As long as it is constant, then I would not be too concerned, as to the 'health' of the engine. A working thermostat can improve things, but in my case, it added an extra 1-2 mpg. After moving off, switching it to snow mode, added around 2mpg for me on the commute mentioned above (I havent tried this over a period of time, just on a two day period, one without, one with it on). Accelerating very gently will also help too, particularly when the engine and gearbox cold. Gearbox oil change theoretically could help (as it may help it warm up quicker and not hold the gears as long) but I noticed no difference.

Best way would be to experiment, initially using the IPK display (for comparable reference only), changing driving style/mode, on a daily test. It will give you an idea of what will work.

Also, even though I never believed it, I did see an improvement of around 20 miles in range switching from 'Go' fuel (supermarket type), and Maxol (I did notice a difference in smoothness or responsiveness, that I cannot explain or convey when I switched also! - the switch was prompted by availability, and not expectant of improvements)

I assume your figure are brim to brim, rather than any IPK display? The displays are notoriously inaccurate (unless recalibrated), my own displays roughly 15% lower than brim to brim - last time I checked it showed 32, and brim to brim was 36.
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Old 21st February 2021, 21:53   #9
Ravinder
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Thanks for the replies. I only checked the IPK. The last time I filled it up, I got around 36-37 mpg. I just filled it up again the other day so thatís still going but I imagine itíll be similar as my trip is similar.

I knew the auto isnít as friendly as manual but thought it would be better then these figures. Iíll also get the car checked properly on a T4 when I have the chance and when restrictions are lifted.
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First name and forum name: Ravinder

Rover 75 2.0 CDT Connoisseur SE 116 (160 remap)
Royal Blue (JFM)

This vehicle was the 50,481st 75 to run off the production line, out of 112,381
This vehicle was the 2,238th 75 CDT Connoisseur SE to be made out of 3,775
This vehicle was the 5,002nd 75 in Royal Blue (code: JFM) to be made out of 14,420 Royal Blue 75s
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Old 21st February 2021, 22:41   #10
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I guess there are many factors to take into account. Weather, road conditions, stop/starts and traffic. Mine's a 2.0 CDTi auto and I average the same around town. From Stranraer to London through the night driving happily at 55 MPH , and in no hurry to get anywhere, I'll manage 50mpg. All depend on the leaded right boot. I'm very happy with my return.
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