Can I improve fuel economy by using quality gasolines?
Yes, several manufacturers have demonstrated that their new gasoline additive packages are more effective than traditional gasoline formulations. Texaco claim their new vapour phase fuel additive can reduce existing deposits by up to 30%, improve fuel economy, and reduce NOx tailpipe emissions by 15%, when compared to other advanced liquid phase additives. These claims appear to have been verified in independent tests [30]. Other reputable gasoline brands will have similar additive packages in their quality products. Quality gasolines, of whatever octane ratings, will include a full range of gasoline additives designed to provide consistent fuel quality. Note that oxygenated gasolines must decrease fuel economy for the same power. If your engine is initially well-tuned on hydrocarbon gasolines, the stoichiometry will move to lean, and maximum power is slightly rich, so either the management system ( if you have one ) or your mechanic has to increase the fuel flow. The minor improvement
