I dont know about the gas to be honest. But yeah, you have to spend in a year a lot of money to cover the difference. If you go their website you'll see a table with the money you have to spend. The lower bound is For a cashback of $60, you need to spend $3000. The upper bound chacback of $1000, spending $50,040. Good luck.
If you have a business and buy equipment and supplies there, it is completely worth it.
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