Sources and methodology

Dimensional and technical data on this site is sourced, and we say plainly when it is not.

Where the guide research comes from

Trade / other 69 (35% of citations)
Community report 58 (29% of citations)
Manufacturer 48 (24% of citations)
Standards / government 17 (9% of citations)
Retailer 5 (3% of citations)
Research / peer-reviewed 1 (1% of citations)

We would rather you saw this than not. A meaningful share of the guide research comes from builder forums, build blogs and video build series. That material is genuinely valuable — it is where you learn that a part failed after eight months, which no datasheet will ever tell you — but it is field experience, not specification. Every reference on a guide page carries a badge showing which it is, so you can weigh a claim yourself. Safety-critical figures should always be checked against the manufacturer's own documentation for the part you actually buy.

How we label figures

OEM verifiedTaken from manufacturer documentation or a published spec sheet listed below.
ResearchedCompiled from procurement documents, archived literature and field reports, with sources cited on the page.
Planning estimateRepresentative of the model family, not an OEM figure. Measure your own vehicle.
Not yet sourcedWe have no figure we trust, so we print nothing rather than a guess.

School bus bodies were ordered to specification by individual districts, so two vehicles of the same model and year can genuinely differ. Every figure here is for planning. Measure before you buy materials or cut anything.

Catalog sources

Source https://www.blue-bird.com/vision-diesel/ OEM verified
Source https://www.blue-bird.com/all-american-diesel/ OEM verified
Source https://thomasbuiltbuses.com/school-buses/evolved-saf-t-liner-c2/ OEM verified
Source https://thomasbuiltbuses.com/school-buses/saf-t-liner-efx-2/ OEM verified
Source https://thomasbuiltbuses.com/school-buses/saf-t-liner-hdx-2/ OEM verified
Source https://thomasbuiltbuses.com/school-buses/minotour/ OEM verified
Source https://www.icbus.com/-/media/Project/Navistar/ICBus/ICBus/Octane/INT25-IC-BUS-NextGen-CE-Spec-Diesel-Gas_June2025.pdf OEM verified
Source https://www.mcicoach.com/site-content/uploads/2023/07/MCI-Jseries_Brochure.pdf OEM verified
Source https://www.mcicoach.com/site-content/uploads/2021/10/MCI-D4020-and-D4520-Specs.pdf OEM verified
Source https://prevostcar.com/sites/default/files/2023-01/H3-45_Spec_2023_EN.pdf OEM verified
Source https://prevostcar.com/sites/default/files/2023-01/Prevost_X3-45_Flyer_EN_2023-04.pdf OEM verified
Source https://allisontransmission.bynder.com/m/ef9b895a24b40a8/original/Pupil-Transport-Series-Brochure.pdf Component verified
Source https://allisontransmission.bynder.com/m/4a271eeac849b297/original/8443-02-Transit-Keystone-SA8571EN_FINAL-lr-pdf.pdf Component verified
Source https://www.cummins.com/en-na/engines/school-bus Component verified

Guide sources

193 references cited across the build guides.

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