I think that regardless of petrol prices, all manufactures should be putting money into cleaner alternatives, exactly like what Toyota, and also Honda is doing.
In regards to fuel prices, diesel engined Opels have been around in Europe for ages, in all models inc our Barina's, Astra's and Vectra's. Only now has Holden bought in a turbo diesel, but why has it taken so long? I'm sure if they had a diesel model in the Astra G range, sales would've been a lot higher.