supermarket fuel

[danny_p]

methanol is funky stuff, needs treating with a lot of respect tho

its really good at poisoning you,  as said it will corrode metals esp aluminium,  and blending lots of it with petrol and running it in a std car will end in tears,  petrol burns with a stoch AFR of 14.7:1  methanol about 6:1  so you end up makeing your engine run lean.

really need a separate tank and 2nd set of injectors just for the neat methanol.  also get big problems with alcohol and petrol blends when they get wet,  only dry alcohol will mox with petrol if theres any water in there it won't,  as for efficency  it's not as bad as youd think  ethanol contains more energy than methanol ( but methanol is cheep ) but alcohols lend themselves to highe compression ratios so naturaly helps thermal efficency.  downside is  in winter neat alcohol don't vaporise very well so starting is intresting

[Seanl]

So to summarise this whole debate, Supermarket fuel is not bad, it just has different additives. Higher octane fuel will not make a blind bit of difference to the majority of cars. Highly tuned cars will benefit slightly, higher output cars will only benefit on long runs where fuel economy will be improved, thus making back the slightly extra price you pay at the pumps. But with lower output cars, you will just be throwing money away. 99% of manufactures state to run them on 95 RON anyway.

I think thats the jist of it, no............

[Organisys]

Yeah pretty much, except you'd be surprised how many cars can benefit from higher RON fuels.

[Dan n Nic]

Ssssoooo, from what was said earlier in the thread, do you have to do anything to the fuel system/engine on imported cars to be able to run without complications?

[Agreeable Slick]

It would be wise to do a full filter change as generally anything outside of the "better" EU countries have pretty shoddy fuel in comparison.

[Godzilla]

Yeah pretty much, except you'd be surprised how many cars can benefit from higher RON fuels.

Indeed.  My slightly modified VR6 runs noticeably better on Shell V-Power (99 Ron)

[Organisys]

Pretty much anything with even a rudimentary knock sensing system, even a mk2 digifant has this.