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Re: Miles per Gallon?
Hi KU
This is a bit of a grey area. I personally don't believe in additives for the fuel system. I've seen too many cases of people that after putting additives in (from many different brands), had their cars start to stall and run rough or not run at all. In some cases, the additives removed a bit of rust that had formed inside the fuel lines, and this accumulated at the base of the fuel press. regulator or at the injector filter screen or inside the fuel pump (from the return line) causing expensive damage for some. Others caused very fine droplets of water left over in the fuel system to group together and stall the car, and so on. So I decided not to use any of them and I don't recommend them to anyone.
I also know some people that will swear blind that additives are good and have been using them for years without dramas.
The easiest way for me to avoid all these problems is to run a tank of high octane every so many tanks of low octane (2-3). That way the deposits barely form at all. If I ever need to clean anything I do it off-car, ie: remove the injectors to clean them, remove the pump to change the filter screen, etc, but this is something I've done probably once in 80-100 000 km. I've also used carbon cleaner sprays to clean the intake manifold, valves and throttle body and it worked ok, but I know that not everyone is keen on removing parts to clean them and the easy way out are additives. So the choice is yours really.
To inspect and have a general idea of how much carbon deposits your engine has, remove the air intake tube that goes from the filter to the throttle body, open the butterfly and have a look. If it looks clean, then more than likely the internals of your engine are also clean. You can also tell by removing the oil cap and looking at the camshafts and valves, as carbon will also find it's way into the engine oil. If they look clean and not covered in a dark/thick layer of crap then the engine is clean. As for the fuel system, the best indicator of how good or bad is always the fuel filter. cheers
marc
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