2020 Mazda CX-30 Base, AWDFACTORY OEM SERVICE PROCEDURE

Poor Fuel Economy: Notes

POOR FUEL ECONOMY (SKYACTIV-G) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item Poor fuel economy
Description
  • The fuel consumption is high compared to the customer's expectations or the previous fuel consumption.
Possible cause
NOTE:
  • The perceived poor fuel economy condition has two causes; the vehicle conditions and how the driver uses the vehicle. Especially, it relies heavily on how the driver uses the vehicle.
  • Engine oil malfunction
    • Improper engine oil level
    • Engine oil contamination
      • Improper engine oil viscosity
  • Improper engine compression
  • Ignition system malfunction
  • Improper engine coolant level
  • Improper tire air pressure
  • Improper tires, wheels (large size, irregular size)
  • Clutch slippage (MTX)
  • Improper ATF level (ATX)
  • Brake dragging
  • Engine operation time is longer than traveled distance
    • Vehicle is driven in congested traffic frequently
      • Vehicle left idling for long periods
  • Amount of fuel injection increases
    • Vehicle is carrying excess items (luggage)
    • Frequent acceleration/deceleration
    • Frequently driving uphill
      • Travel distances are short (engine does not warm up)
System wiring diagram
  • Not applicable
Connector diagram
  • Not applicable
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.