For the last 5 years, I’ve been using a special liquid fuel additive in my 4.0 litre XJ8. Every 3 months, since 2015, I’ve poured 2 bottles into my fuel tank, because that’s the recommended dose for my car. I’ve spent over £600 in that time. Having used the FTC pellets, I can see I was wasting my money! With FTC there’s been a massive change in the car’s performance and smoothness. Now the car is so quiet you can’t even hear if its running and just a little pressure on the accelerator and she’s off like a bloody rocket! It’s like having a brand-new car. Wish I’d found FTC years ago and saved all that cash!