More than a week after the last round of changes to pump prices in Singapore on May 8 — with diesel prices adjusted downwards and petrol prices kept unchanged — oil and gas company Shell has raised petrol prices but reduced its posted price for diesel.In a price board update published at 4.30pm on Monday (May 18), Shell announced a 3-cent hike across its petrol offerings, while reducing its diesel price by the same amount. The move also pushed its more premium 98-octane petrol past the $4 mark again.Following the latest round of pump prices adjustments, the price of the more popular 95-octane petrol now ranges from $2.64 at Cnergy, to $3.49 at Shell.Meanwhile, the more premium 98-octane petrol is now priced between $3.05 at Cnergy and $4.01 at Shell. Read more