Premium fuels-Are they worth the extra? - Page 12 - Renault Forums :: Independent Renault forum

View Poll Results: Premium fuels-Are they worth the extra?
Yes - I get improved MPG 8 14.04%
Yes - I get improved performance 11 19.30%
Yes - Itís greener 3 5.26%
I donít use it Ė Itís too expensive 38 66.67%
Multiple Choice Poll. Voters: 57. You may not vote on this poll

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post #56 of 65 (permalink) Old 30th November 2008
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Originally Posted by Lagdti View Post
57.3 from a 2.2dCi.

I'm off to check eBay for cheap Lag 2's.
57.3 was a very much one off Lag I drove like a Nun I could hit 50 and a bit pretty easy, but when I toggled through the OBC and found 57.3 MPG I had to think twice about changing the car, tbh had at the time Renaults rep have been better with dCi's I'd have gone for another diesel again. the petrols are are OK, but after having diesels the damned petrols are too easy to stall
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post #57 of 65 (permalink) Old 30th November 2008
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exhaust pipe

thats where it all goes. out the exhaust pipe, some injector cleaners may benefit by cleaning them, but in a diesel, i think the only additive needed is the one to prevent the tank getting the diesel bug, u read all about these additives and other gimmicky fuel saving devices, but no scientific evidence to support them.
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post #58 of 65 (permalink) Old 30th November 2008
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The diesel additives that you pure into the tank or straight into the system just raise the burn temperature in the cylinder,so they can clean up the emissions for a short time (i.e around MOT time),but on the whole they cause more bad than good.I suspect that the additives on the 'premium' fuels do the same,just at a slower rate.

I'm very wary of petrol additives,but then that is my personal opinion.Some people swear by them,some swear at them.

I'd rather push my Alfa than drive a BMW....
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post #59 of 65 (permalink) Old 30th November 2008
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Originally Posted by hondo View Post
Years ago diesel was way cheaper than petrol, I wonder how the price switch came about.
Aye it used to be quite a bit cheaper too, not just a little. I think the change came about when the sales of diesel engine cars took off and the government saw another obvious way of screwing us out of more cash


I think I have CDO. It's like OCD, but with ALL THE LETTERS IN THE RIGHT ORDER
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post #60 of 65 (permalink) Old 1st December 2008
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The diesel bug is a myth. The dirty stuff that tends to collect in diesel fuel is actually formed by the water or moisture that diesel tends to attract as it can be hygroscopic.
Any additive added to the fuel will enter the engine via the fuel injection system where it will be burnt. If it removes any deposits there are only 3 routes for exit. One is the exhaust, then there is the engine breathing system and thirdly it ends up in the lube oil . And if you have one of the more modern engines fitted with an exhaust filter I would guess it may get caught in there.
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