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Old 14-10-2013   #1
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Real world MPG

I've not seen any good MPG fights for a while...

What mpg are people getting these days? How accurate do they find the computer?

With my mods on a 1.9mjet 150 I am now seeing 99.9 on the computer if I drive at a steady 50mph on the motorway and nearer 80mpg combined (though it does drop if I start driving spiritedly)

With the car as standard, the best I could get was 52mpg and more like 40s combined...

I will however need to fill her up again to see what my real world cost per mile / mpg is.
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Old 14-10-2013   #2
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Re: Real world MPG

No way you are getting anywhere near those figures, I await with interest your figures when you brim the tank!
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Old 14-10-2013   #3
'13 Punto MultiAir 105
 
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Re: Real world MPG

What modifications are these?
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Old 14-10-2013   #4
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Re: Real world MPG

Tuning box and removing BOTH cats.

Completely standard, I was lucky if I got 470 miles out of a tank. I was seeing nearer 600 before replacing the pre cat - shall let you know what difference that now makes, but deffo higher again.

Obviously if I drive the car hard economy falls away, but I'm finding having a heavy foot with the mods is giving me the same / better economy than frugal driving in a standard car.
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Old 15-10-2013   #5
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Re: Real world MPG

Quote Originally Posted by Fergie View Post
With my mods on a 1.9mjet 150 I am now seeing 99.9 on the computer if I drive at a steady 50mph on the motorway and nearer 80mpg combined (though it does drop if I start driving spiritedly)
So a full tank will take you 1K miles will it?
(57 litres @ 80 mpg = 1,002 miles)

142201Z
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Old 15-10-2013   #6
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Re: Real world MPG

Quote Originally Posted by austenw90 View Post
What modifications are these?
Electric motor, and a hamster powered alternator that drinks diesel.
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Old 15-10-2013   #7
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Re: Real world MPG

From full till when the light comes on i can usually get 450-470 miles so thats 550-570 miles on a tank of fuel. thats on a standard 165 sport. Worked it out at between 47-51 mpg on a daily comute and drive around town. this as opposed to my last car a Focus ST which did around 28-30 mpg if i was lucky and similar driving.
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Old 15-10-2013   #8
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Re: Real world MPG

Quote Originally Posted by Caravadossi View Post
So a full tank will take you 1K miles will it?
(57 litres @ 80 mpg = 1,002 miles)

142201Z
I did say that is what the computer is showing

I think it is overly optimistic, but no harm in filling up, doing 20 miles @ 50mph and then filling up again to see what she actually uses.

Main thing is I've seen my real world mpg increase by over 20% which partly offsets the cost of fuel and helps justify some light mods.
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Old 15-10-2013   #9
'13 Punto MultiAir 105
 
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Re: Real world MPG

Quote Originally Posted by Fergie View Post
I think it is overly optimistic, but no harm in filling up, doing 20 miles @ 50mph and then filling up again to see what she actually uses.
To my mind this doesn't really represent the mpg you willl achieve with normal driving. Your test should be either based upon your usual driving to show the real world mpg you achieve or on a long run where you are using a good portion if not all of the tank - say Glasgow to Manchester (as an example). I'm sure that if I drove my 2.0 Multijet 20 miles at 50mph the computer would tell me something like 65mpg (or 55ish possibly real world) however this would not at all represent anything other than driving at 50mph everywhere I went which is never the case so therefore not accurate at all.
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Old 15-10-2013   #10
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Re: Real world MPG

Because a tuning box is outside of the ecu the trip computer does not see any additional fuel injected hence the false economy figures, tuning box suppliers will probably not point this out and their customers will believe they have amazing economy. In reality a tuning box might improve economy a bit but not massively
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Old 15-10-2013   #11
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Re: Real world MPG

MY real world firgures, and I've left note on fill ups showing what the Trip showed.

http://www.fuelly.com/driver/mep/bravo
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Old 15-10-2013   #12
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Re: Real world MPG

Quote Originally Posted by Fergie View Post
I did say that is what the computer is showing

I think it is overly optimistic, but no harm in filling up, doing 20 miles @ 50mph and then filling up again to see what she actually uses.

Main thing is I've seen my real world mpg increase by over 20% which partly offsets the cost of fuel and helps justify some light mods.
Well – ya talk-the-talk … but d’ya walk-the-walk?

Q1. What figures have you used for this >20% improvement?

Q2. What are your current black-box read-outs?

Range ………. miles
Distance ………. miles
Av.mpg …….. .. mpg
Inst mpg (not required!)
Av speed ………. mph
Time ………. hrs/min

Q3. On an M-way on diesel fuel – what constant speed gives you better mpg, 50 or 70 mph?

Q4. Given your alleged (i) 99.9 or (ii) 80 mpg – what ml of diesel do you estimate you’ll require for 20 mile @ 50 mph?

Q5. Brim-up & put-up your range read-out.

151105Z
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Old 15-10-2013   #13
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Re: Real world MPG

I am going in for a remap from Angel Tuning in the near future and was in a car of similar spec (engine size, BHP, torques mpg etc etc) that had a remap done. He is now getting 210 bhp and also an extra 12% mpg. He has gone from 45-50 mpg up to 53-57 mpg. With DPF removed he might get even more. By the way it wass an Audi S4 2ltr TDi 160 bhp (original spec)

PS The pull oh the machine was frickin awesome.

PPS which by the way doing the maths would be approx 554 - 580 miles between fill up and light coming on
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Last edited by bravosl165; 15-10-2013 at 19:12.
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Old 15-10-2013   #14
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Re: Real world MPG

My 2008 Multijet 1.9 8v 120bhp is getting about 50mpg at the moment brim to brim from nearly empty, the on board computer over estimates it by about 3 percent. This is in mixed motorway & town commuting. During the summer I was getting about 53mpg - can't duplicate that in the colder weather. Anyone else seen this degradation?
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Last edited by madmalc; 15-10-2013 at 20:45.
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Old 15-10-2013   #15
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Re: Real world MPG

Brimming it after 20 miles is unlikely to give an accurate figure IMHO
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