Do you use super unleaded?

[magoo]

I drive diesel now but i used a tank full of super unleaded once and can't say i noticed the blindest bit of difference.

 

[tedebear]

You may notice the difference only if you have a seriously tuned engine - but for standard engines its a swizz....

 

[JJ McClure]

I drive diesel and use the regular tesco derv, but I read a report somewhere from a motoring journalist who was sceptical about the whole super fuel option, in which he filled up and did notice an improvement.
I tried it the other week filling up with Shell Premium Optimum Super Fly Diesel before a work trip up to Hull and maybe noticed it ran a little better but not that noticeably.
My understanding is that it is supposed to give better performance, better economy and help the engine. It may be worth it every now and then but only if my company is paying for the fuel.

 

[m20gull]

Use it in my MG-engined Mini van and it makes a lot of difference.

 

[Cian]

I have a diesel, so I think I might poison it slightly if I did...

I do notice an impact on performance if I use Topaz-sourced (Tesco/"Shell"/"Statoil" (both are just rented brand names) diesel in it as compared to Esso/Emo/Maxol/Texaco, though, even starts worse at times.

 

[hans kraay fan club]

Big. Con.

 

[MORTY]

I drive diesel now but i used a tank full of super unleaded once and can't say i noticed the blindest bit of difference.

Did you use the Super Unleaded while driving the Diesel? I bet you'd of noticed the difference then.

 

[beorhthelm]

its all a con... except the shell optimax/vpower what ever its called. its a higher octane than anything else, which means you get a bit more power out of it (can put more air in the mix wihtout causing knock). your highish end engine will adjust to this automatically. ive heard after prolonged use stripped down engines look like new. so thats nice.

 

[Easy 10]

I occasionally used super unleaded, when I want to look dapper and slightly reckless (but in a good way) on the garage forecourt.

 

[gullshark]

i use vpower.

but if I don't my engine will det its tits off.

 

[Uncle Spielberg]

whats it got to do with you

 

[Icy Gull]

Definitely make a difference with Alfa twin spark engines

 

[tedebear]

In some modern cars the engine management system will need telling if you change fuel (retarding ignition timing) , although many ems's will adapt the running to the fuel type but only after they've had several tanks of the stuff....

But as Icy aludes there are some engines which are designed to run on the higher ron fuel, with the difference being a loss in horse power of around 5-10 bhp.

 

[gullshark]

i always get stick of people that think i don't need it.

Well, when you're running 1.1 BAR boost and about 300 hp i'd rather my engine stayed in one piece!

 

[surrey jim]

used to use it when repping and company paid fuel, i used to get about 20-30miles more per tank

 

[SpidersLegs]

My engine needs an octane rating of 98 ron or above so I use it more often than not.