Research Methodology: Sources, Calculations and Limits

Start with a claim that can be checked

MileShift Report publishes source-linked automotive research for English-language readers, primarily in the United States. A useful research question is specific: which engine a document covers, what a study measured, or whether a factory announcement describes a plan or completed production. A broad claim that an entire brand is reliable needs much more evidence than a description of one documented feature.

This page explains the method expected for revised coverage. It is not an accreditation, laboratory protocol or certification that every older article has completed expert review. The Editorial Policy sets the publication’s broader standards, including advertising and contributor disclosures.

Match the evidence to the vehicle and market

For a technical statement, identify the relevant model year, market, powertrain, production range and document date where available. A bulletin for one engine or an announcement for another country cannot silently become a claim about every US example with the same badge.

Prefer the original regulator record, manufacturer document, service information or study publisher for the claim it is qualified to establish. Read the supporting passage, not just a search-result snippet. A link to a brand homepage is not enough when the article makes a precise statement about a repair, component revision or affected production range.

Keep evidence types distinct

A manufacturer announcement establishes what that organization announced. A recall describes a defined safety action. An owner complaint records a reported experience; it is not automatically a confirmed defect or a population failure rate. A service document must be read within its stated applicability rather than treated as a recall notice.

When sources disagree or leave a gap, narrow the conclusion and describe the uncertainty. Do not fill missing evidence with an invented sample, simulated inspection, expert quotation or numerical confidence score. Images and interface graphics are presentation elements unless an article establishes their evidentiary role.

Make calculations reproducible

A calculation should show its inputs, units and method. The annual repair-cost guide, for example, distinguishes published reference measures from arithmetic conversions and a hypothetical personal budget. A monthly amount obtained by division is not a new observation from repair invoices.

For cost comparisons, keep the same time horizon and expense categories. Explain whether taxes, labor, tires, financing or depreciation are included. Preserve source years, and do not relabel old measurements as current prices merely by changing an article’s review date. Scenario outputs depend on assumptions; they do not predict an individual failure or authorize a repair.

Interpret bylines and review dates accurately

AI assistance has been used in revised material. AI-generated text is not a primary source, and fluent wording is not proof of accuracy. The Authors & Reviewers page explains the collective publication byline and why it does not identify a verified mechanic or licensed engineer.

A review date indicates work on the article or its sources, not a vehicle test date. Named professional review, original testing or access to private manufacturer records must not be implied without evidence of the person, activity and scope involved. This methodology does not claim that MileShift operates an accredited testing facility.

Make limitations and corrections visible

Research should help readers ask better questions while making its boundaries clear. A guide is not an inspection, warranty determination, recall-clearance certificate or assurance that a car is safe to drive. Use the appropriate official information and qualified assistance for the actual vehicle.

If a factual claim is unsupported, outdated or incorrectly applied, follow Fact-Checking & Corrections. Provide the page URL, exact passage and strongest available source. Material corrections should explain what changed and why; a formatting adjustment should not be promoted as new research. Commercial interests do not substitute for evidence or purchase a preferred conclusion.