Right, an interesting experiment. Just been on a road trip and where possible I always use Shell in my JLR stuff as I've found the Td5's and V6's preffer it and produce the least amont of smog when bending the firewall with the loud pedal. So my run was 300 ish each way and I filled to the brim from quarter of a tank each way. The trip up hill I filled with V power and the trip back with common or garden Shell. Both ways took about the same time and where outside lane all the way. Going up gave 34 on the dash and coming back gave 31.

Discuss 08 2.7 RRS "S"
Td5 110......very modified
RS 5
Kawasaki ZX12R me, it's quick !

I used to always put the good stuff in, since had a change of heart and think its all a big con and its a rip off as it is, why voluntarily pay more?

Am I wrong? Should I go back to the good stuff?

I'm trying to do the percentages and it probably works out better in favour of using more of the cheap stuff ! The 2.7 does run quieter on V and the 3.0 TdV in the Jag loved the V, like you say it is probably a rip off ! 08 2.7 RRS "S"
Td5 110......very modified
RS 5
Kawasaki ZX12R me, it's quick !

being of sceptical disposition (think "nitrogen in the tyres? what a load of ") I'd like to see proof positive before changing from the cheapest, usually Tesco. Not hearsay, or opinion, just cold hard quantitative data. ============
2010 TDV8 HSE - ooo laa laaaaaaaaa
2007 TDV8 HSE - superb car and very reliable
============
2012 - dearly departed, sadly missed.. to return in late 2013 with a new TDV8!

Since changing from supermarket diesel over to Shell "normal" diesel my both my TDv8's have not only run better, the fuel consumption is better by 3-4mpg (on the trip it's even better!) and I don't get a black cloud out the tailpipes if I floor the loud pedal 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Last edited by Tim in Scotland on Tue Aug 09 2011 4:45pm. Edited 1 time in total

Did you see the top gear test with Alonso & his Ferrari F1 car where they ran it on the F1 Fuel then on normal forecourt juice. The results were very close and infact Alonso said that in some areas the normal fuel had a quicker throttle pick up than the F1 stuff Ofcourse, if you want to be a healthy cynic then you may argue that this just makes a nice marketing stance for Shell to sell more fuel on the forecourt...... but surely... Top Gear wouldn't fall for that, would they?......  2013 Discovery HSE Luxury - 3.0 SDV6 - Santorini Black
2013 Evoque 5 Door Pure Tech SD4 - Orkney Grey with Panoramic Roof (Mrs E's new baby)

GONE - RRS - 3.0 TDV6 HSE - Santorini (2010)
GONE - RRS - 2.7 TDV6 HSE - Java Black (2007)
GONE - Porsche Boxster S - 3.2 - Black

Dont start me on the nitrogen filled tyres ffs ! 08 2.7 RRS "S"
Td5 110......very modified
RS 5
Kawasaki ZX12R me, it's quick !

I've run several 'fleet' test on fuel.

The UK has common prevailing winds and a two-way trip can easily have a variation of 10% on fuel used just because of this effect.

You'd need to plot a circuit very carefully and ensure you drove exactly the same if you really wanted the answer.

If you think your RRS runs better then that's a good enough reason.

I wonder how much the atmosphere affects consumption ?? ie on the way up it rained most of the way and the way back it was dry and sunny ????? 08 2.7 RRS "S"
Td5 110......very modified
RS 5
Kawasaki ZX12R me, it's quick !

Cost 10 per cent more, get 10 per cent better MPG, no difference to the wallet, use whatever you feel is better for your RRS  2019 BMW X3 2.0i M Sport in metalic black- Brilliant
2014 Mitsubishi Outlander PHEV Atlantic Grey, replaced with 2018 Frost White Outlander PHEV, can't fault em - now gone
2012 SDV6 HSE in Orkney Grey, Privacy Glass & Side Steps (notice a theme)! - Even better but now gone
2009 TDV6 HSE in Stornoway Grey, 20" alloys, Privacy Glass & Side Steps - Fantastic! but gone

Tim in Scotland wrote:

Since changing from supermarket diesel over to Shell "normal" diesel my both my TDv8's have not only run better, the fuel consumption is better by 3-4mpg (on the trip it's even better!) and I don't get a black cloud out the tailpipes if I floor the loud pedal

andy r wrote:

Dont start me on the nitrogen filled tyres ffs !

I admit, I got suckered into that one once (once I hasten to add)......correct, what a load of old S t  L322 Big Daddy SUPERCHARGED 5.0 Autobiography - Here & Now!

5 series for the miles

RRS S/C factory built HST - Gone

45 others have been and gone!

The chemistry is there for nitro filling, but for it to work properly the tyre needs to be fitted and inflated in a nitro purged chamber, other wise you are just pressurising 10 litres of normal air with nitrogen, so the pressure is still unstable ! 08 2.7 RRS "S"
Td5 110......very modified
RS 5
Kawasaki ZX12R me, it's quick !

Both the RRS and now the merc have had problems running on shell.

Usually when warming up and under accleration have had mis fire and the kangeroos, evrytime it has happened has been on shell fuel.

As for the orig post hard to tell wind direction can make just as big difference to mpg

No matter what the fuel.........its way too B y expensive

Brent crude now below $100 a barrel and oh what a surprise, the pump price still thinks its $125 a barrel - £1.36 Unl/litre.....someones making money and as to quote the Petrol Retailers Association..."its not us" W s...........

We may be idiotic in this country when it comes to cohesive action, but we are not all balaclava wearing Kyle show watchers who communicate using uggs....... daylight robbery, plain and simple. L322 Big Daddy SUPERCHARGED 5.0 Autobiography - Here & Now!

5 series for the miles

RRS S/C factory built HST - Gone

45 others have been and gone!