That seems to assume they were paying nothing for fuel, before the tax credit.

If one assumes paying, even $2 per litre for fuel before, the $50/week covers the fuel price increase up to over 450km per week at current prices (== (50/(3.33-2.00))*(100/8) )
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In practice I assume the $50/week is mostly intended to cover inflation in the cost of other goods and services, caused by the embedded fuel cost component(s) going up.

(Which is going to affect everyone, so the targetted assistance to maybe 20% of the population is surprising.)
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