since i had a new thermostat fitted my turbo has leapt from around 26mpg average to 31mpg over a tankful....im gonna really try on the next tank to behave and see what i can eke out...or, i might just say sod it, thats not what i bought teh damn thing for...i use 'normal' unleaded as the garage we have our account at doesnt stock 'super' of any kind...bu**er...

And I thought I was the saddest man in the country this weekend I too have been conducting an MPG test for the last tank:

I got sat-nav a couple of weeks ago, and have been driving (Wherever safe) at the exact speed limit according to Sat-Nav, avoiding braking wherever possible. This has mostly been on long Motorway drives. I'm still to complete the test, but based on the needle on the tank, my current estimate is an improvement of 15-20% in fuel efficiency based on normal 'accelerate/brake' driving.

Current estimate is I'll get 37mpg, where I normally get 30. Not bad when you think this equates to a saving of about £12 for every £60 of fuel bought !

Boring though, so I think a better idea would be to save the money elsewhere !

(Sainsbury's fuel, as there was nothing else nearby at the time)

I have done 420 miles and still have 3 quarters of a tank left...

Oh sorry did I forget to say the sender unit was fooked

A while ago, I did some tests of Shell V-Power versus regular Tesco 95 RON. From a cost point of view, I calculated that the additional cost of the Shell V-Power was almost exactly matched by the increase in mileage achieved. I think the difference was about 7-8% at the time. (ie. V-Power cost 8% more, and I got 8% more miles from the tank).

Therefore, the cost per mile of them both were almost identical. However, the performance did seem fractionally better with the V-Power, but that might have been imaginary. I'd say there's not a lot in it really unless you're really driving the car at the margins of its performance.

When it comes to straightforward efficiency at normal road speeds, there are much greater factors involved than the fuel.

As a benchmark, I have a regular 20v, with a straight-through exhaust, and I generally get 420 - 460 mpg on a full tank of whatever fuel comes to hand. Most of my driving is on motorways where I normally drive 'quickly but smoothly'.

This is'nt true.. I drive 600 miles every week and have tried eveery fuel there is... 95 octane fuel got me 43mpg last week!!

I did a new personal worst yesterday of about 100 miles on half a tank. It was brilliant!

(Just need to tape the letterbox shut for the next few months and not answer the door).

hahaha brilliant!!!

420 - 460 mpg now that's a record!!!!

fwiw,

450Km including
250Km @100mph (motorway),
50km @120+mph (motorway, bored and playing with a vectra coupe turbo ),
130km city driving (start stop 1-2nd gear @30+ C) and
20km racing 2 PunotGTs and a 20vt in Athens
costed me 43lt of 99ron, or in yourspeak around 30mpg which I find absolutely amazing!

As Nigel says, headwork does pay back (also looks like my custom map is quite good at keeping mixture stoich for up to 4Krpm, then drops to 13.6AFR at 4.2-4.5Krpm)
Just for an example I used to get that sort of fuel consumption when driving on a motorway under heavy rain (at 70-75mph) before the engine rebuilt!

V.

Who cares anyway, as lets face it, nobody ever bought a Coupe to see who could get the most MPG............

525 miles, boring ones at that
but it's good to know it can be done

Exactly , its boring so whats the point????? Just go buy a diseasal........

well, iv reached 400 miles on a tank..thats a record for me.....mostly back road or m way miles inc. jaunt to edinburgh and back today.....pretty chuffed with that tbh...

If you were really serious about fuel economy, buy a Barnacle Widget, have it set to read throttle angle and teach yourself how to maintain a given speed at the smallest possible throttle angle

"Best" mpg I have managed was probably less than 10mpg on the track days I have done. Didn't do accurate calculations as the tanks concerned got me to the track, but not back! Average was about 18mpg, and as over half the mileage was getting there where I would normally expect 30mpg that is what I base the less than 10 on.

I know if I stuck to less than 70 on motorways I would get a lot more, but if that was what I wanted I wouldn't drive the coupe. A Smart diesel is very tempting though!

or get an Apexi avcr - and show TPS, revs and boost.
Then try and keep the TPS less than 40%, revs below 3krpm and boost in the vacuum. Very dull though

Oops. Miles per tank ! Good point ! If only !

My 16VT does about 16 mpg on my every day commute. (which involves standing almost still in traffic for half of the time and using the turbo once in a while...)

Last week was a school-vacation so many people were away for a week: empty roads. Did about 28 mpg last week, when I didn't have to stop all the time...

I think I can do even better if I keep it off the turbo and drive like my dad...

I'm also going to have to talk to my boss about my travel expenses. I get 19 eurocents/km while the coup costs me about twice that...

i feel very lucky as i get a full tank f fuel a week from my boss and that covers my 'work' miles......so in reality, its up to me if i wanna save the environemnt and put the fuel in my cinq or stick it in something half sensible like the coop...or waste it all on stoopid cars like the 928 i used to own.....

worked out fuel con. over last tank as 402 miles on 52 litres....34mpg....more than happy with that...

Driving up to Barnsley in the 20vt on Friday night, we got 38.2mpg over a hundred and sixty miles at <cough> a shade under eighty... I had it up to 39.5 at one stage but then we hit standing traffic for a while which brought it down...

Oh, yeah, I knew there was something... that was the Cupra

20 miles urban and 70 miles motorway at 85kph 55mpg in a brand new car It's quite easy to tell it's not a coop too