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Relatively cheap in Norway too (taxes heavily emission biased). When lighter batterys (than the lead accumulator) becomes better and more economically feasible, I predict more hybrids on our roads. Maybe with the petrol/diesel engine working only on optimal revs to charge the battery leaving the electro motor to do the job.
There's also some patents on new multi-fuel fixed-rev engines which may turn out being suited to do exactly this job.
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