Vehicle & Technical > Defender

Sainsbury City Diesel MPG

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DogVanMan:
Ridge, RRB thanks..

Ridge, interesting that, because in my old 300tdi I could throw Millers Power Plus in and it made little difference, on the Td5 with additive and before the mods it certainly felt a little better and MPG figures were improved. I alternated between tankfuls with and without additive for over 2000 miles and it was consistently worse without additive. I used to keep an eye on the mileage with the 300 tdi and I never noticed a measurable difference. Not very scientific but a good indication, I think. Perhaps the electronic management of the more modern engines can make better use of better fuel??? Dunno.

RRB. That makes perfect sense.. I hadn't thought of it like that, yes we do want diesel fuel to self ignite quicker! Also explains why additive manufacturers refer to 'improved' cetane figure, not 'higher'.

I'd love to see a list of cetane ratings for different pump diesel fuels (and especially Sains City Diesel), but I guess it doesn't exist. Unless anyone knows different..?

G

Range Rover Blues:
I can tell you the cetane ratiing of bio is worse.

As for additive, I guess it was down tot he relative effeciencies of both engines, the TD5 would be "programmed" to self tune with the changes in fuel hence the improvement in performance or economy.  The 300 bless it will just plod along with whatever c**p you put in there.  You could in theory tune a 300 to make the best of the best fuel, but heaven help you if you fill up with tat.

ChrisV8:
Over the years and with a number of vehicles I have found that I get much poorer MPG and performance from supermarket diesel, my Jeep is very poor getting about 40mpg on Supermarket but up to 50 using Shell, yesterday on a trip to Brum and back 48mpg and I got there in under 2.1/2 hrs from here 150 miles !!

I worked in Aberdeen with a TD5 90 and only once put supermaket diesel in it and it was awful, no go and very thirsty. The tanker may go to the same place for a fill, but they don't put all the additives in supermarket stuff I am told, me I stick to Shell for all our vehicles cos it works best and generally is no more than the supermarket as they tend to compete on price as well.

Range Rover Blues:
Our local branded stuff doesn't price match the supermarket, so I have to think about whether the extra MPG pays me to use it :-k

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