Spool Mercedes M177 GLC63 AMG Wireless Ethanol Analyzer Kit

Spool Mercedes M177 GLC63 AMG Wireless Ethanol Analyzer Kit

The Spool wireless ethanol analyzer displays the actual ethanol content and fuel temperature on a smartphone. It is especially useful on cars running E85 or custom ethanol blends where the calibration expects a known ethanol percentage.

Fuel sold as E85 does not always contain exactly 85% ethanol. Spool notes that E85-rated fuel may contain roughly 51–85% ethanol, so measuring the fuel in the tank removes the guesswork when preparing a blend.

How it works

• A GM/Continental-type ethanol sensor measures ethanol content and fuel temperature
• Bluetooth Low Energy sends live data to the phone with very low power consumption
• The free Spool app shows the reading and includes an ethanol mix calculator
• Vehicle-specific fittings and adapters allow a clean installation with the factory fuel lines

This is a useful addition to a tuned car where fuel composition directly affects the calibration and safe engine operation.