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Just use a decent fuel, almost all fuels have additives in them and they do an eyewatering amount of research into getting the dose right. If Shell have to do a million miles of test driving to "prove" that their fancy new additive fuel gives an extra 9 miles per tank full there's not much chance of your experience passing the bar of being proof, sadly. Back in the day, when additives in fuels weren't so common, doing your own dosing could help, assuming you got the mix right. The problem with trialling these things yourself is that its very, very difficult to rule out external factors that influence fuel efficiency and the influence on driving style when the driver is more conscious of fuel economy. Driving style can vary fuel consumption by upto 20%. Having worked with the Petroleum industry, I can confirm that they would gladly sell their grandmothers for the chance of making very small additional market share in the huge market they operate in, so if Redex did deliver the improvements you hope for, they would have been bought out decades ago. My Fabia loves a tank of Super unleaded and a motorway drive, and I can get almost 700miles range with that, but its still more expensive on a per mile basis than the same trip on regular unleaded.

Hello - I have this fault and am in the place where the pump is what is left to do. Did replacing it work? Many thanks

Hi - I've had the Amber ABS and Traction control lights illuminated on on the dash for a while. They went through a period of being on initially, but then after a short drive would go off, but now they're just on all the time. I put a diagnostic reader on and it showed a fault with the rear left ABS sensor so I replaced that and cleaned down through the hole as much as I could. The fault code for the sensor giving inconsistent readings has gone with being cleared by the reader, but I'm left with the lights on the Dash still being illuminated as Amber and the trouble code: C1 01 C01 Active/static Left rear ABS wheel speed sensor Electrical error I can't see any damage to the wires as far as I can check. Does anyone have and guidance on what the problem might be or what I could do next to try and resolve it? Many Thanks

Hello - Just joined to find useful info Thanks for being here