Shell got into trouble for saying fuel save would save you fuel over a tank, because there was no proof of this. FACT!

Yep, the ASA told them to stop using that advert.

http://royaldutchshellplc.com/2011/10/21/shell-false-claims-over-fuelsave-featured-on-bbc-tv-watchdog-programme/

I've just driven 300 miles up and down wales on hilly roads, using bp ultimate, which costs no.more than Asda petrol and got 9mpg more than with Asda fuel, based on maxidot. These roads do lend themselves to better economy and there are other variables but my driving style was similar and both readings were from maxidot, so some of this 9mpg is due to the fuel I'd say.

Im not saying that your wrong about possible increase in MPG but using a certain fuel and doing a road once or one you do not do on the regular basis is not strictly saying that its the fuel saving you the money.

Everyone has a different driving style and everyone drives different in different weather conditions but what i find to be the most influential on driving is how tired you are. I drive over the moors road connecting Whitby to Guisborough very often, about 25 miles and has plenty of hills, on average i get 45MPG, when im in the mood to kick its teeth in i can get as low as 34MPG but when im getting tired (not too much that im unable to drive) iv once got 57MPG and that was doing an average speed of 60mph, to this day i dont know how i achieved it but its not always down to what fuel you use.

For what it's worth Stu, I'm 100% behind people saying petrol makes a difference because it does.

On a petrol car however you're having to get the right amount of air, the right ignition point etc.

In a derv, it really is massive excess of air and it explodes when you crush it enough (pretty much tdc).

There's little a fuel can do to change this, other than be naff and full of shorter chained HC (petrol) or much longer chain HC (Heavy oil).

Anyway, if people want to pay for premium derv, I'm good as it means the oil companies can make their profits, with a marginally less large increase on the normal stuff

Anyway, if people want to pay for premium derv, I'm good as it means the oil companies can make their profits, with a marginally less large increase on the normal stuff

I still don't get how the oil companies can get away with selling the same diesel at a higher price saying it is better, without someone taking them to court, especially if the staff admit that the only difference is the price.

I get marginally better economy from Shell standard diesel, compared with my nearest supermarket source, Tesco.

And as they're the same price, I use Shell.

Oh, and 'derv' relates to the vehicle, not the fuel.... (Diesel Engine Road Vehicle).

Indeed, but the pumps used to say derv many years ago, back when i started driving.

They also used to be alone, not under cover and well away from anyone else, only flowing at high speed.

That's another story though

Oh, and 'derv' relates to the vehicle, not the fuel.... (Diesel Engine Road Vehicle).

TBH every definition I can find says the opposite, ie DERV is the fuel not the vehicle.

Just read in the local paper that the Belgian Police has issued a notice to it's highway patrol units to use the "normal" variants available at the pump. Any mileage improvement, if any, is cancelled out due to the higher costs.

I always put Shell normal diesel in. Never had a problem, and getting good mileage aswell!

What about marine diesel?

What about marine diesel?

Nah. Tescos "Finest" Kerosene is what you want!