What causes drop in ...

[movan]

What can cause a sudden decrease in mpg normally attained, please?

(I don't mean such as being heavy on the pedal or pushing revs etc .. I mean is there anything like diesel, oil, gear box, etc..)

Thank you.

 

[Stealaway]

Hill's- mines always hilly routes. If it's really old then diesel fuel pump or injectors.

 

[jongood]

fuel leak?
Flat tyres?

 

[movan]

Thanks both. I've just filled right up again and will check once more .. I WAS a bit heavy footed on last long journey but didn't expect it to affect consumption as much as it did.

Can't see a leak and tyres seem ok ..

If it happens again I will ask garage to check fuel pump and injectors.

I like to sound as though I know what I'm talking about when I go into a garage.

 

[jongood]

Sticking brakes? Are any of your wheels hot?

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[Silver-Fox]

Dirty air filter won’t help ?

Weight in the vehicle.

 

[Sundowners]

Any black smoke????

 

[sonny]

What was the difference mpg?

 

[mushy]

Weight in the vehicle.
[/QUOTE]


Ooh that was brave.

 

[HandyAndy]

Do you use an app to track the mpg or are you guessing?

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[Paul and Kate]

Air filter would be my first call. Cheap and easy to replace too Joy.

 

[Silver-Fox]

Weight in the vehicle.

Ooh that was brave.
[/QUOTE]

Or stupid ?

movan knows very well I’m not referring to her good self ?

 

[Chris51]

Do you use an app to track the mpg or are you guessing?

View attachment 328420

What are the quotes for..Honda 50 ,?

 

[Wh05apk]

Biggest thing for me is wind, can make about 4-5mpg difference. Has it just been one tank full, or the last few?

 

[HandyAndy]

What are the quotes for..Honda 50 ,?

quotes??
That just my little shed of a commute car I use while still in my work clothes a old 1994 Peugeot 106. One day I'm sure it will fall apart but it's been 15 years and I'm still waiting

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[M-J]

Driving over 65mph reduces ours more than you’d think.

 

[buttons]

Hills as already mentioned and Head winds will cause drops in MPG. If you are driving for an extended period into the wind then it will make a difference to your normal economy.

 

[Chris51]

Try to cruise at around 55/60 and shortshift gears and get about 33 AVE mpg....2.2 Relay lwb.

 

[Chris51]

Biggest thing for me is wind, can make about 4-5mpg difference. Has it just been one tank full, or the last few?

I get a lot of wind..
Don't affect the mpg though .

 

[2657]

Increasing speed from 50mph to 60 increases wind resistance by 44%, 50 to 65 by 69%

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[MyrtleGuru]

Letting the gap between me and the HGV in front grow to more than 6ft. Once a cyclist, always a cyclist -- tuck in behind the big guy when the wind gets up

 

[Chris51]

Letting the gap between me and the HGV in front grow to more than 6ft. Once a cyclist, always a cyclist -- tuck in behind the big guy when the wind gets up

Tailgating ?

 

[MyrtleGuru]

Tailgating ?

We prefer to call it slip-streaming
I believe triathletes call it drafting (or draughting?).

 

[movan]

Any black smoke????

No smoke.

 

[movan]

What was the difference mpg?

Vast. About a difference of 9 mpg. Have to be fair I am normally easy on the revs etc and this time desperate to get home I was well over speed limit for considerable distance. So it may be MY fault.

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[movan]

Do you use an app to track the mpg or are you guessing?

View attachment 328420

I worked out how many gallons of petrol I had used for the journey and the miles my satnav said I had travelled.

 

[Chris51]

We prefer to call it slip-streaming
I believe triathletes call it drafting.

Tell that to the Gendarme when you get caught,,!

 

[movan]

Biggest thing for me is wind, can make about 4-5mpg difference. Has it just been one tank full, or the last few?

Just last journey .. approx 210 miles.

 

[Jaws]

I have noticed our MPG always suffers when the temperature drops..
For instance, in January going to Spain we average 21.2 mpg
Coming home mid March it goes up to 22.5+ MPG

This has happened every year for the past 11 years .. and we are always heavier coming home than going

 

[Chris51]

I get a lot of wind..
Don't affect the mpg though .

Just last journey .. approx 210 miles.

I keep the fuel tickets and write mileage on each time I fill up.

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