AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
200 miles per tank... suggests you could also be running too rich.
Does the car warm up (86-90C) when you're driving along, or does the temperature hover around 60-70C mark? The latter would suggest dodgy thermostat. It's worth changing if it's shot - it quickly pays for itself if it can get your mpg up to 35-36.
If your injectors are clogged/dirty the octane booster might improve things just because it will clean some of the gum out as you use it. However, if you do think your injectors might (or could use) a clean, buy some paraffin from Homebase/B&Q (sold as Turpentine Substitute.. do not use White Spirit) and run 200ml of that through the tank, every time you fill up. That would also help to keep the injectors clean.
No bullets for Chaingun..