Amongst the areas being covered by the investigation are pilot error and fuel quality.

However direct cofiring systems are also more sensitive to variations in fuel quality and heterogeneity.

Tensions between these two groups arise on subjects such as fuel quality, safety, and blending.

They also had difficulty with the more demanding requirements for fuel quality and oil purity of the Allison engines.

The question of fuel quality for non-road and off-road machinery is still outstanding.

Mr President, my report concerns the improvement of fuel quality.

These environmental improvements will not be possible unless they go hand in hand with improved fuel quality.

However, there is a downside to the improvements that we have achieved on land and in fuel quality.

On the other hand, fuel quality is essential for engine performance and to reduce vehicle emissions.

Research evidence has shown that our suggestions - for example on fuel quality - have solid underpinning.