I've being running my car as close to empty as I dare then brimming it (vrs) takes around 45L for numbers sake we will say 10 gallon the trip compete says I'm getting around the 49 mpg mark but I only get 380 to a tank of fuel

I know the trip computers are a little out but this seems a lot ?

if you are town driving or have a lead foot it will drink fuel......it loves motorways though.

I'd say that's slightly low miles for a tank. I can't compare because I only put in forty pounds at a time and get about 350 miles mixed. I got 100 miles extra driving in Wales and back to Suffolk for the same money.

Check boost pipes, boost logs, maf readings, torsion value, fuel filter, air filter and finally bearings, brakes and tyres. My old 05 plate Fabia wouldn't get as much as my new 04 plate however servicing records were sparse on the 05, plus it had had more owners. Definitely comes down to how it's looked after over the years and if you have had owners who have been passionate about their Skoda, it certainly helps!

Mine has been fully looked after and has no issues at all.

 

Ive i drive like a granny i get 400 miles, if i drive in the other style then i get 380

It's a mix between town and motorway driving

I had looked at boost pipes and all seem fine I do have a bit of a lead foot I will admit I have serviced the car myself and it came with fsh

I don't mind the kiwis have mpg just the difference between the trip and actual

I have to drive mine with a very heavy right foot to drop below 400 miles to a full tank. I have achieved over 500 before and nearly 600 after venting the tank.

The worst economy I had was for the first two weeks I had the car before I went to stage 1. Even now with a bigger turbo and not far off double stock power it is still more economical than it was as stock!

I think each car is very different, my mrs vrs does pretty much the same driving as mine and she gets 480

I have to drive mine with a very heavy right foot to drop below 400 miles to a full tank. I have achieved over 500 before and nearly 600 after venting the tank.

The worst economy I had was for the first two weeks I had the car before I went to stage 1. Even now with a bigger turbo and not far off double stock power it is still more economical than it was as stock!

Venting the tank? Modified, or just unscrew?

380 with mixed driving is about right I can get about 450 if doing sustained motorways. (420 mixed driving and about 480 on sustained motorways if I fill the expansion tank as well.)

Venting the tank? Modified, or just unscrew?

Theres a little leaver on the inside of the filler neck that can be depressed with the fuel nozel. It releases the air from the expansion tank and replaces it with fuel if you do this though you need to do a decent drive soon after or you risk damaging the pressure seals on the fuel tank.

I've never ever used the expansion tank, just literally start filing up until the pump clicks and stops, around £38-£40 of diesel from Asda gets me roughly 360-380 miles on average no matter how i drive, even with a very heavy foot and a bit of fun over the weekend i've never had less then 350 miles out of it

I get nearly 600 on my PD100. Whilst I don't think there's that much difference in efficiency between the PD100 and VRS, there's probably less temptation to floor it. And even on the PD100 that will kill the MPG.

Only time I've gotten figures that low is when I travelled 250 miles to the mothers and didn't realise I dragged a flat all the way there.. 250m to a full tank of fuel that day!

With current prices I get about 90miles to a tenner that all town driving aswell. Mpg on dash is calculated on injection quantity in the map, that could be different every second , cant imagine the ecu doing calulation every second. So i would imagine it takes every few readings, over a week you could end up with a big difference.

Does sound like a mix bag of results but a quoted 50 mpg for the car and for all those get 380m to a 10 gallon tank is no where near 50 mpg

380 miles to 45L is about 38mpg... But lets call it 43 litres for arguments sake, because you will never run it bone dry, which would then = 40mpg.

 

The book combined cycle figure for these is 53mpg but bear in mind that was achieved in a lab so you won't necessarily see that on the road where conditions vary massively. 

 

I don't get brilliant mpg out of mine but I know the type of journeys I take during the week, which are mostly short and town, plus the fact I like to have a good blast at the weekend to blow out the cobwebs account for it. My trip shows an average of 48mpg over almost 2000miles but it's more likely to be around 40-42mpg real world from what I've worked out, I only see 400+ from a tank on a run and I'm not brick footed on the throttle. 

 

On a run it's defiantly capable of 50-60mpg real world IF you drive it sensibly. Any heavy footed acceleration or carrying weight will then drop it fairly drastically.

 

Also consider that people's cars will be in different states of tune and health which accounts for the variation in mpg as does the different style of driving each person has and the conditions and roads they drive on. 

At least it's not just me that the trip lies to then

It's only a basic system on the vRS and it can be even more inaccurate when your running different sized tyres/wheels to standard. 

 

The only way to get a truly accurate reading, or as near as damn it, is to do the figures yourself based on how many litres you put in and how many miles you actually get out of it. 

 

There is a good read here which explains why there are such variations from the trip and actual mpg....

 

http://blog.caranddriver.com/why-your-trip-computer-isnt-giving-accurate-mpg-readings-and-how-to-fix-it/

I normally get 350-400 miles until the fuel light comes on and I refill. The trip computer shows I still have 70 miles to go until empty.  So for 380 miles I'd fill with 37ish litres of fuel.

its alllll lies