The fuel excise is already sort-of meant to be a tax on km driven. Buy more fuel, pay more tax. So I can see where the government is coming from.
But yeah, I also think we need to make low emission vehicles more attractive. The upfront cost prices out too many prospective buyers. You basically need to also own your own home and have solar panels installed to really get the best out of them.
I wonder whether the people who drive the most statistically are the people who buy electric vehicles. I suspect they aren't.