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move the journey itself from car to train, rather from old car to new car.
Spot on, it's actually better to keep your existing car than to buy a new economical one that's better for the environment as we're only contributing to the increasing number of cars on the road and thee enviromental cost of building new cars.
I and my partner thought about getting a new car (she drive) that does slightly better mpg and better torque with much better safety feature but realised it's more economical to keep using our old Ford Fiesta from 2014 even if it mean we have to make several attempt to go up a 30% hill.
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Not necessarily, at some point you will break even with a more efficient car and it may be sooner than you think. https://youtu.be/L2IKCdnzl5k
And the discussion should be how do we effect modal change- move the journey itself from car to train, rather from old car to new car.