Using Vpower for "engine cleaning"

Using Vpower for "engine cleaning"

Good Morning

I'm keen to make my car last as long as possible and have been interested in vpowers cleaning properties.

However according to my manual my Corsa it recommends 95 Octane and describes "possible" for 98. When I've used Vpower before my MPG does seem to dip slightly by 2-3% but I chalked that up to the ECU being used to processing Shell regular unleaded.

Are the engine cleaning benefits worth enough spending the extra money, say every 1-2k miles?

For context I do about 25kmiles a year, mostly on motorway and only use shell regular fuel.