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1.4 TSi ACT economy

Mr Pig

Active Member
Jun 17, 2015
1,480
408
If I thrash the throttle I get 30-35mpg but usually it's about 38, only ever had 40 in motorway driving
Pretty far off what I was hoping for, and Seat's figures. Ok, we know the latter is fiction but it's not even close.
 

HighFlyingBird

'16 FR 1.4 150
Jan 15, 2019
250
87
Leeds
Pretty far off what I was hoping for, and Seat's figures. Ok, we know the latter is fiction but it's not even close.
Seat's figures of 64 extra urban and 57 combined is a fair bit out. Highest I saw mine was 40.1 on the way home from the Blackpool meet earlier this year.
 

Mr Pig

Active Member
Jun 17, 2015
1,480
408
Seat's figures of 64 extra urban and 57 combined is a fair bit out. Highest I saw mine was 40.1 on the way home from the Blackpool meet earlier this year.
The official top figure for the 1.6 TDi is 72 mpg I think. The highest I've achieved is just over 60mpg so you're talking eleven or twelve mpg out.

If 40 mpg is the best you can get out of the 1.4 TSi that's a massive 24 mpg less. That's not trivial, in my opinion it's fraud. People buy cars based on these figures and how accurate they are has real world financial implications. These lies cost people a lot of money.

VW were sued because their cars did not meet emissions claims. Why are they not sued because if their economy claims are total lies?
 
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HighFlyingBird

'16 FR 1.4 150
Jan 15, 2019
250
87
Leeds
The official top figure for the 1.6 TDi is 72 mpg I think. The highest I've achieved is just over 60mpg so you're talking eleven or twelve mpg out.

If 40 mpg is the best you can get out of the 1.4 TSi that's a massive 24 mpg less. That's not trivial, in my opinion it's fraud. People buy cars based on these figures and how accurate they are has real world financial implications. These lies cost people a lot of money.

VW were sued because their cars did not meet emissions claims. Why are they not sued because if their economy claims are total lies?
My car is remapped but I doubt that'd throw a whole 20mpg down the drain. There'll be a loophole in the fine print that gets them out of being sued over the performance claims. They'd probably just pull a variation of what Apple did with the iPhone 4 and say "you're driving it wrong"
 

Robd1984

Active Member
Jan 25, 2015
42
1
Chelmsford essex
I have a 1.4 act remapped to 178bhp I have a 22 mile commute to work and I average about 49mpg and that’s A roads averaging about 50mph. I track my mpg via a Fuelly app and the car averages 44.7mpg over a whole tank.
 

Sword

Active Member
Apr 22, 2019
105
42
Winchester
I average nearly 60 mph on motorways if traffic is clear in roadworks which I think is really good for a petrol turbo.

Average between 50 and 55 on standard motorway drive which is basically diesel numbers.
 
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Mr Pig

Active Member
Jun 17, 2015
1,480
408
I average nearly 60 mph on motorways if traffic is clear in roadworks which I think is really good for a petrol turbo. Average between 50 and 55 on standard motorway drive which is basically diesel numbers.
That is brilliant. Are you a grandmother? ;0)

I have a 1.4 act remapped to 178bhp..
No way I'd have the guts to do that. I'd be terrified the thing would blow up! A road driving, between about fifty and sixty, does give the best economy. Faster than that and aerodynamics turn against you. Faster you go, the more power you need for a given speed increase.

I track my consumption by filling the tank then making a note of the miles and liters next fill and working it out. Been doing that for years, it's just habit now, and gives you exact figures.
 

Robd1984

Active Member
Jan 25, 2015
42
1
Chelmsford essex
Those engines are bullet proof it will handle an extra 28bhp. I don’t drive it hard but it’s nice to know that it has the power if I need it.
 

Mr Pig

Active Member
Jun 17, 2015
1,480
408
To be honest, I wouldn't bump up the power on the 1.4 as I'd want the independent rear suspension before more power.
 

Rockbox

Active Member
Apr 6, 2018
111
32
I average nearly 60 mph on motorways if traffic is clear in roadworks which I think is really good for a petrol turbo.

Average between 50 and 55 on standard motorway drive which is basically diesel numbers.

Mine was doing 62.1 mpg average in the roadworks on the M62 cruise set to 50 mph let the car do the rest.
Once out of the roadworks needless to say the mpg went down.
 

Mr Pig

Active Member
Jun 17, 2015
1,480
408
Mine was doing 62.1 mpg average in the roadworks on the M62 cruise set to 50 mph let the car do the rest.
Once out of the roadworks needless to say the mpg went down.
Years I followed the Thrust SSC land speed record attempt. There was a bit of competition between the Thrust team and an American team but ,as you'll know, the Thrust guys took the speed of sound.

The Americans didn't give up and were determined to get to 1000 mph. The Thrust team were more professional than the Americans and had better physicists and aerodynamicists on board. I remember one of them explaining that it was impossible for the Americans to get to 1000 mph because they didn't understand the physics. The thought it was just a little bit faster but didn't understand that to go that little bit faster would require enormous amounts of extra power. What seemed close was actually very far away.

Interesting read: LINK

Another: LINK
 

JackB

Active Member
Jan 18, 2020
83
45
Not sure if all Mk3 Leon DSG's do it (Think my gearbox is a DQ381) but mine will drop the car in to neutral if you use the Eco settings and lift off the throttle completely, makes a huge difference if you let the car coast at the right times (e.g. down hills or along the flat if you are anticipating a need to slow down ahead - but its too early to be braking).

I once got an indicated 50mpg out of my Cupra 290 on a run from Birmingham to Manchester!!! A combination of 50mph roadworks, heavy (but not too heavy) traffic conditions keeping speeds down and a gentle approach using Eco is what made that number possible.

Using manual tank to tank calculations, my best has been 43.7mpg (mostly motorway) and my worst has been 24.5mpg (mostly B road blasts). Typical mixed numbers are in the mid 30's, if the performance is being enjoyed its sub 30.

It does not seem like the 1.4 TSI does that much better based on the reading above! Clearly it is a bit better but not as much as I would have expected.
 

Sword

Active Member
Apr 22, 2019
105
42
Winchester
That is brilliant. Are you a grandmother? ;0)
Haha, easily done at 50 mph in roadworks and 77 outside them ;)

Town driving it goes down to under 30's but again it's a petrol turbo so I dont expect any different.

All in all coming from my previous turbo petrol cars I am very impressed with the mph achieved.
 

seatram

Active Member
Sep 8, 2017
113
60
Ilkeston
I have the 1.4 125 and I’m getting 36mpg, mostly short journeys, around 10 miles a day.
Same engine, mostly stop/start traffic for me with an average speed of around 13mph. Getting anywhere between 33-35mpg, 36 if I behave myself!
 

BigJase88

Jase
Nov 21, 2018
1,067
386
Dumfries & Galloway
If you look at the quoted figures, since the wltp has came in and the new regs on mpg calculations the figures quoted now are more realistic to real world driving

the old 1.4's state 54-57mpg
the newer 1.5 tsi states 45-48 mpg

and that's with the new 1.5 being upto 20% more fuel efficient than the 1.4 it replaced.

so in reality the 1.4tsi should be around low 40 mpg's
 
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