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15Mpg !


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#1 mrmeds

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Posted 07 January 2019 - 07:55 PM

thats what I seem to be getting from my 998cc mini city at the moment. I filled her up on dec 1st- made a note of the odometer, and today filled her up again with 26.72 litres  ( 5.87 gallon) and covered around 93 miles.

The engine is 998cc with stage 1 kit. I thought it may be running a bit rich as it starts getting hot in stationary traffic, even in winter ! Could this rich running be responsible for this lousy fuel consumption or could there be other reasons ?  Could you lose significant fuel through  an ill fitting fuel cap ?

Had the car since sept  and it was last mot'd in june and didn't seem to have any emissions problems then.

 

Any thoughts welcome !



#2 absx2

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Posted 07 January 2019 - 08:04 PM

Could be anything but I would start by making sure there are no fuel leaks when the engine is running from the fuel pump and float bowl.

Modern fuel eats through old petrol hoses so check under the tank as well.

Are the plugs black, if it was very rich it would have a misfire at hot idle.



#3 sonikk4

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Posted 07 January 2019 - 08:04 PM

Has it been serviced, has it been set up on a rolling road for the stage one kit. Lots of variables but the rolling road will be the best bet.



#4 hazpalmer14

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Posted 07 January 2019 - 08:17 PM

Did you fill up at the same pump, because it you used a different petrol station the ground might be slightly off meaning you full rank isn't as accurate

#5 DeadSquare

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Posted 07 January 2019 - 08:32 PM

Is someone stealing fuel from your tank?



#6 mrmeds

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Posted 07 January 2019 - 08:38 PM

Has it been serviced, has it been set up on a rolling road for the stage one kit. Lots of variables but the rolling road will be the best bet.

not had it serviced yet, but previous owner had it rolling road tuned last summer - Not sure where my nearest rolling road facility is !



#7 mrmeds

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Posted 07 January 2019 - 08:39 PM

Did you fill up at the same pump, because it you used a different petrol station the ground might be slightly off meaning you full rank isn't as accurate

 

yes !



#8 mrmeds

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Posted 07 January 2019 - 08:39 PM

Is someone stealing fuel from your tank?

 

my petrol cap looks nice, but doesn't lock ! so is a possibility !



#9 mrmeds

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Posted 07 January 2019 - 08:45 PM

Could be anything but I would start by making sure there are no fuel leaks when the engine is running from the fuel pump and float bowl.

Modern fuel eats through old petrol hoses so check under the tank as well.

Are the plugs black, if it was very rich it would have a misfire at hot idle.

time to invest in spark plug spanner ! It did smell quite petrolly when the weather was warmer, which I put down to too much choke but could be a leak- will try and investigate next weekend



#10 JXC Mini GT

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Posted 07 January 2019 - 08:47 PM

If you are doing short journeys on Choke with the engine not getting fully warmed with lights, fan, etc on you will get low MPG, but 15MPG points to a fuel leak.



#11 pdaykin

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Posted 07 January 2019 - 10:06 PM

One of mini used to lose fuel out of the cap during enthusiastic cornering. Didn't know until a friend was following me

#12 Midas Mk1

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Posted 08 January 2019 - 03:54 PM

Google map your route and check, wouldnt take the odometer as gospel. 



#13 Minigman

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Posted 08 January 2019 - 05:24 PM

Could be a dodgy odometer unless you know the distance covered for sure. Follow a set journey on a sat nav and check your odometer is working correctly. Or follow a mate in a modern car and get them to measure the journey.

Edited by Minigman, 08 January 2019 - 05:28 PM.


#14 mrmeds

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Posted 08 January 2019 - 08:44 PM

sure the milage is pretty accurate as i've only been pottering around the confines of bath at weekends throughout december- no big journeys- Though I will do the google map thing again, as I've not done it since I changed the speedo a few months ago !



#15 mrmeds

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Posted 09 January 2019 - 08:02 PM

did a small journey today- only about 9 miles but the odometre was pretty much spot on- so can rule that out. I reckon it would have to be under reading by 75-100 % to get the fuel economy reading I worked out






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