It sounds like possibly the total mileage and the business mileage entered don't equate to 80% business use for TurboTax to arrive at the $2,790 amount. Check all your entries in this section.
You depreciation deduction may also be limited by your business income. If this applies, unused depreciation will carry over.
Depreciation for business vehicles is calculated differently than for other assets.
This article has more detailed info for Business Vehicle Depreciation that may help you.
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