Rattle that starts at 3000rpm - suspect low oil having caused hydraulic tappet damage and subsequent rattle noise (see 'Noisy Hydraulic tappets' above) try some RESTORE and make sure to keep the oil level at...
Blue Smoke on hard acceleration is due to piston blow-by. RESTORE will fix this in 500 miles providing the piston rings are not broken. Check the compression in each cylinder to find out if all cylinders are...
Can I improve my MPG? The obvious answer is to remove all the heavy stuff from the boot! Overloading your car with stuff that you don't need to cart around will have a negative effect on your fuel...