I reverse-engineered car lease math against three real dealer documents

Name: I reverse-engineered car lease math against three real dealer documents
Availability: InStock
Author: amirjavid

by amirjavid·Mar 4, 2026·2 points·5 comments

AI Analysis

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Reverse-engineered lease math verified to the cent against three real dealer documents.

Strengths

•Core formula is mathematically elegant and deterministic—once inputs are correct, output is exact, making verification straightforward and defensible.
•Extensive ground-truth verification with real dealer docs (three states, three lenders, three tax structures) demonstrates rigor absent from most 'consumer tools.'
•Directly solves a real pain point: dealer lack of transparency forces buyers into blind negotiations—this flips asymmetry by making math auditable.

Weaknesses

•Distribution and reach unclear: how do car shoppers discover this vs. dealer websites or other financial tools?
•Assumes buyer can extract MF and NCC from dealer quote—tool is powerful only if end users actually have the documents and understand how to input.