The good wife n I went up north a year ago..hired wee rental hybrid... it surprised me how zippy it was and yes could see it charging when going downhills.... yes we used less fuel than we would have if driving normal wagon so yes it was a saving..BUT it would be no bloody use at all here in south canterbury where most of our roads are pretty much flat...
we have a "THING" on our milk tankers that is a far more nifty fuel saving idea... I roll its called,it basically chucks the auto transmission into neutral when your coasting along,going downhill.... the furtherest Ive done so far is 9kms and still had to brake at corner as still doing 70kmph SLIGHT downhill with tailwind.... but it really only works with a heavy wagon that will maintain its momentum.
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