Previous car was a Saab 95 1.9TiD on supermarket fuel the tickover was noticeably rough, very noticeably so. I switched to Shell VPower the tickover improved almost instantly. It wasn't just me, this car/engine had reputation for poor tickover and Shell V Power was a fix several other users used.
Didn't notice any performance gain or improved mpg.
I now use Costco fuel which has good reputation. Switching between this and V Power in current car I don't notice any difference.
FWIW V Power is said to include a % of synthetic diesel, said to burn cleaner, kinder to DPF.
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