Iowa School Bus Fleet | Cerma Diesel Treatment Case Study

St. Ansgar Community Schools - Fleet Diesel Treatment Results

David Juls, Director of Transportation at St. Ansgar Community Schools in Iowa, shares the results of treating their entire school bus fleet with Cerma STM-3 diesel treatment.

Fleet Overview

  • 11 school buses – 3 vans and 1 car treated with Cerma
  • Mileage range: 11,000 to 224,000 miles
  • Engine types: Various diesel engines

Key Results

  • Significant reduction in idle noise – Especially in older buses
  • Transmission shifts smoother – Better drivability
  • Improved fuel mileage – From 7-8 MPG to 9+ MPG on some vehicles
  • Bus #17 (2003 with 200k miles) – Went from 6 to 20k miles improvement
  • Buses run daily – Averaging 60 miles with shorter trips and cold starts

Fleet Mileage Improvements

Vehicle Before After
4 Buses - 10 Mystery Conversions Baseline Improved
4 Buses - 466 DT 7-8 MPG 9+ MPG
3 Vans and Car Baseline 1 to 3 MPG improvement

View the full testimonial below:


Questions about Cerma for school bus fleets or diesel applications? Call 239-344-9861 or email Info@cermatreatment.com