14 replies to this topic

[fairshepherd]

Just done my usual uni commute from birmingham to cov uni and back again its about 38 mile round trip. Its pretty much a straight 60mph run for most of it. i seem to get bad fuel consumption when i have to go fast used about 1/4 of a tank up 2day. Just wondered if this was normal for a 998.

[Jammy]

Depends how fast you go really and which final drive you have (which I assume to be standard). You should get about 50mpg at 50mph.

[Big_Adam]

i did 160 odd mile mini run. on the way there used 1/2 tank (top half of the dial. seems a little less sensitive to fuel level in my world) stuck in 4-5 squid and used that on the way back. so 110 miles there and about 50 on the way back.

wait......dose that make any sence. basicaly i used the 5 squid i put in (from how it looked on the dial) on the 40 miles at 70mph on the way back. and its a 998 too.

did have bad consumption for a wile it was all sorts 1st the fuel pipe then my pump started dumping fuel into the sump. fun.

[1984mini25]

I've found that driving at about 55mph i'm getting just over 45mpg

from my carb (Hs4) standard 998

[JA1987]

My spi changes alot. some days I can get 35+mpg others its
more like 28mpg. Tempremental cars when it comes to
fuel.

[AlexM]

My spi changes alot. some days I can get 35+mpg others its
more like 28mpg. Tempremental cars when it comes to
fuel.

If its that bad sounds like you have a problem. I get about 45mpg from my spi cooper.

[Neilos]

i get C**p fuel consumption aswell. Ive got a 1275 auto and it drinks fuel big time. I think to do about 40 miles was about 10 quid. Its always been harsh, but seems worse now, whether fuel prices have compensated for that i dont know!

[Dan]

Just done my usual uni commute from birmingham to cov uni and back again its about 38 mile round trip. Its pretty much a straight 60mph run for most of it. i seem to get bad fuel consumption when i have to go fast used about 1/4 of a tank up 2day. Just wondered if this was normal for a 998.

Depends, which 1/4 of the gauge are we talking about? The gauge isn't very linear or accurate (or good really). In a good condition late 998 you should get about 55 mpg at a constant 55 mph in 4th. You need to know some of the numbers to work out your fuel consumption, saying 1/4 of a tank is a bit vague.

[fairshepherd]

i worked out my consumption awhile ago at around 35mpg. but let me try doin it again. filled up monday morn and then did around 120 miles then filled it up again took about about 15ish liters in. so thats 4 galons. so thats 30 mpg. it does normaly do abit beter then that but i had to do alot of driving at around 60mph this week. oh and its a totaly standard 998. any idea what i can do to inprove this, thanks

[Noah991]

My SPI is pretty bad also. I seem to be getting about 12-15 km per liter.. Should be getting more than that.

[Dan]

any idea what i can do to inprove this, thanks

Yup, work on your maths. 15l is closer to 3.2 gallons. That makes 38 MPG.

[fairshepherd]

well i guess 38mpg not to bad. Oh and my phones converter (samsung d600) said that 15l is 3.96 galones it must be set on us galons or sumit thanks for the recalculation anyway dan ill try and do better nxt time lol

[my mini rulez]

does anyone have a CLEAR way of working it out please

[mini1976]

Yes

Fill your car up at the local gararage and try to do it in a way you can repeat again. So if you say put the nossel into the tank as far as you can and then fill untill it cuts out. As soon as it cuts out stop. Tank a note of the milage. Then drive the car as normal untill next time you need to refill. The longer the better as is will give you a better average. Then refill at the same garage with the same pump using the same technique so in theory you should fill it to a similar level. Take a note of your new millage

The take the no of litres you have put in the second time and devide by 4.5 to convert to gallons

(4.5 litres = 1 uk gallon)

So if you put 22.5 litres in when you re fule thats 5 gallons

Then take your new milage and subtract the old one to get how far you have driven inbetween filling up

(Say you have done 180 miles between filling up)

Then devide the 180 miles by the 5 gallons of petrol you have used to get the MPG which in theis case is 36MPG

The advantage of this method is if you do it every time you fill up you will notice if your fuel consuption changes and this might highlight a problem. Even if you dont use the same petrol station it will give you an indication of the MPG your getting.

The other option (which might be more acurate but the first is what i would recomend) is to drive (with a can of 4.5 litres of petrol in the boot) till you run out. Then pour the spare fuel in (being carefull not to spill any) and take a not of your milage. Then drive to a garage and fill up taking a not of how much fuel you put in (and fill up your spare can again too) then drive till you run out of fuel again. Add the 4.5 liters of spare fuel to what you put in when you filled up to get the total amount of fuel in litres and then devide this total by 4.5 to get it in gallons. Then devide the milage you have done since the first time you ran out of fuel by the number of gallons to get the MPG.

[redhotmini]

oh and make sure your speedo reads correctly! Mine worked out at 4mpg but the sppedo reads seriously slow for some reason.