Diesel performance booster?

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Don't even think about puttin Optimax in there :o)

Don't worry, wasn't going to, I heard it's no good and a ripoff. I want some kind of juice that makes it better.... Hmmm, my mechanical terminology is so good.....

Injector cleaner can make a difference - seems to have perked mine up a bit. Other than that if it's turbocharged get it checked out for loss of boost?

Also it could be just craving for summer diesel, winter diesel does seem different to drive with.

For your car, yes.

You could put some snake oil in the tank?

See my other post...

As other posters have commented, you may be used to it.

You're also running on winter diesel, which makes a difference. Some cars are not fussed, others are certainly fussier.

Have you checked your tyre pressures and other funkiness such as binding brakes and whatnot?

Depends if you drive a petrol car requiring high octane fuel or not...