Which technician is correct regarding the impact of alcohol in fuel on vehicle driveability issues?

Technician B's statement regarding the impact of alcohol in fuel on vehicle driveability issues is correct because alcohol, such as ethanol, can significantly affect fuel properties and vehicle operation. Ethanol is commonly blended with gasoline to create fuels like E10 (10% ethanol) or E85 (85% ethanol), and this blending can lead to variations in fuel volatility, energy content, and combustion characteristics.

When alcohol is present in fuel, it can create issues such as reduced fuel economy, as ethanol contains less energy per volume compared to gasoline. It can also lead to driveability concerns during cold starts or in high humidity conditions because alcohol can absorb water, which can cause phase separation in the fuel tank. This phase separation may result in corrosion or damage to various engine components, affecting overall performance. Additionally, the use of alcohol-blended fuels requires specific calibrations in modern engines to optimize fuel injection and ignition timing, and failures to accommodate these changes can exacerbate driveability issues.

Meanwhile, the other technician's statements might not accurately reflect these complexities or may misinterpret the role alcohol plays in fuel performance, thus leading to misunderstandings about its effects on vehicle driveability.