Xantia hdi Fuel economy & fuel brand.

XantiaJon · Post by **XantiaJon** » 09 May 2006, 20:51

I've just filled up my Xantia, 603 Miles on 54 LITRES. 50 mpg. The best i've got to date! Normally get around 45 mpg, seems more dependent on the make of Diesel then how it's driven.
BP Ultimate is the worse (41 mpg), Normal BP, Shell & supermarket diesel average 45mpg, ESSO diesel seems to be the best overall.
It does feel quicker on BP ultimate, but not worth the extra price or drop in economy>
Anybody else found these differences? I've done 4000 Miles since the end of march, so the more mpg the better.

Oh looks like i've got 2 names on here jon888999 is me too! Just noticed I posted earlier with that name, funny I can't remember registering twice!

rory_perrett · Post by **rory_perrett** » 09 May 2006, 20:57

Whenever this one comes up, usually in the context of super market fuel vers branded fuel someone says that the fuel comes from the same storage depot and its all the same. Must say Im with you on this one. I'm convinced my car goes further on Total than Tesco fuel with shell somewhere in the middle. Been collecting data for a while but need to work out if the difference is statistically significant. Sample size for filling at Tesco and shell is smaller than for Total.

Rory

goldfinche · Post by **goldfinche** » 09 May 2006, 21:09

Hello Both my son and I run Citroen's and find that ESSO does make a difference to the general running and most certainly MPG.
Supermarket fuels do not seem to offer the same MPG. (The very low sulpher "green" fuels seem to be worst of all.)
Cheers.
Geoff.

howiedean · Post by **howiedean** » 09 May 2006, 21:14

goldfinche wrote:Hello Both my son and I run Citroen's and find that ESSO does make a difference to the general running and most certainly MPG.
Supermarket fuels do not seem to offer the same MPG. (The very low sulpher "green" fuels seem to be worst of all.)
Cheers.
Geoff.

In the 50000 miles I did in my hdi, I never got better than 46 mpg for my normal driving regardless of which fuel. The best I ever got was 54mpg and mine was a the 110bhp estate!!!

Regards

rory_perrett · Post by **rory_perrett** » 09 May 2006, 21:28

Just quickly done the maths

2.1td figures for approx 60,000 miles (130k to 190k)

Tesco 44.45 mpg
ESSO 45.51 mpg (only 5 fill ups)
Shell 46.07 mpg
Total 46.79 mpg

Totally un-scientific but that's 5% more from Total which means (at today's prices) Total could be nearly 5p a litre more than Tesco and it would still workout cheaper. If they are the same price thats a £50 per year if you are doing 10000 miles per year

caveman_si · Post by **caveman_si** » 10 May 2006, 00:01

there was a piece on the news about filling up with fuel i think by Martin lewis (the money expert man). Depending on what time of day you filled up copuld affect how much fuel you get. Basiclly he went on to say you by diesel/petrol etc by volume therefore if you bought it at nite/early morning when it was coldest then you would get more fuel for your money giving a saving of up to £30 or £50 a year for normal driving (cant rememeber how many miles they said was normal th).

So buy your fuel when its cold gents and you'll get more for less regardless of brand.

James.UK · Post by **James.UK** » 10 May 2006, 02:24

To make a fairly accurate MPG calc. Fill the car right up and zero the mileo.. then when you need tooo, fill right up again, but make a note of th number of litres used to fill up.. Then read and write down the miles covered on the receipt.. After that go to :- http://javascript.internet.com/math-rel ... llon2.html

Enter the "miles covered" in the top box, and the "litres used" in the 2nd box .. press "compute".. And your MPG will be displayed in the bottom box

My ZX averages 30ish around town (due to autobox not engaging 4th gear under 40 MPH) and anything up to 55 MPG on a long Mway run.. Overall, my combined average is about 39 MPG..

Homer · Post by **Homer** » 10 May 2006, 02:26

I've been quite disappointed with the 807's consumption and so far I have struggled to average 30mpg anywhere, even at a steady 60mph.

But recently got 32mpg on a round trip, not driving with economy in mind.

The only difference, I filled up at the local ASDA instead of my usual ESSO. Since filling up at ESSO again it's dropped to it's usual 26mpg

I'm going to try and repeat the test at the next fillup.

XantiaJon · Post by **XantiaJon** » 16 May 2006, 12:55

To prove a point to myself lastime I filled up with BP Ultimate, Just filled up again with Esso, 54 LITRES did 515 miles 43 Mpg. Same Journeys same driving as the week before. I really must stick to Esso!

Gammy leg · Post by **Gammy leg** » 16 May 2006, 16:18

I was under the impression that in the past all fuels come from the same sources and it was just the name on the tankers that were different. Can't guarantee that the same still hold true today though.
In the past, the extra additives in Shell, BP, Esso etc, were added on the forecourt by the tanker driver which, on more than one occasion, led to damage being caused to engines when the driver got the mix proportions wrong.

Another reason for the difference in recorded fuel economy may be from the accuracy of the fuel pumps on the forecourt. I don't know what the allowable tolerances are but based on an enquiry I made to Trading Standards regarding hand rolling tobacco, the tolerance on a 50gram pouch is +/- 7.5g ( 15% ), scary.

Gammy

BonceChops · Post by **BonceChops** » 17 May 2006, 06:31

Gammy leg wrote:I don't know what the allowable tolerances are but based on an enquiry I made to Trading Standards regarding hand rolling tobacco, the tolerance on a 50gram pouch is +/- 7.5g ( 15% ), scary.

Gammy

Think of the difference between to packs at each end of the tolerence. 1 could be 57.5g and another 42.5g thats 15g which is 30% of 50g. So 2 packs could vary by almost a third of the stated back weight. You win some you loose some, I bet you loose more than you win. If it was my company I would try to weigh the product to within a couple of grams and make all the packs on the low side of the tolerance

Homer · Post by **Homer** » 17 May 2006, 08:28

Gammy leg wrote:
Another reason for the difference in recorded fuel economy may be from the accuracy of the fuel pumps on the forecourt.

The onboard computer agrees with my manual calculations so the pumps can't be out by much.

Gammy leg · Post by **Gammy leg** » 17 May 2006, 10:43

Chaps

I don't dispute that different brands of fuel may give different fuel economy figures, presumably due to the blend of additives that are mixed in with the 'raw' petrol. My point was that there are other influences that should be factored into the eqation before a definitive answer can be reached.
I fill up with U/L at Tesco twice weekly purely because it's the cheapest around, clubcard points, and I've got a company car and fuel card so economy checks are something that I no longer bother with. If I ever went back to paying for my own fuel in my own car then I would be dusting off my old notebook and calculator with the rest of you chaps. Aaaah, memories of my old 1.4BX come flooding back.

Gammy

BonceChops · Post by **BonceChops** » 17 May 2006, 11:58

We all work out our mpg taking the milage from the speedometer which could be as much as 10% out as well. So that could mean the difference between 45mpg and 50mpg.

Gammy leg · Post by **Gammy leg** » 17 May 2006, 13:00

Speedos may not be 100% accurate but any error would be consistent so you shouldn't get variation in mpg figures.
Different driving styles, different fuel station pumps, different brands of fuel would have more of an effect.

Gammy