The variant is designed to be quieter, more economical, and more environmentally friendly. Most proprietors were reluctant to get rid of their very reliable and economical Fairways. It made the printing of images for commercial usage more economical, feasible, and realistic. The XU-1 was more agile, cheaper and more economical. The Reliant Robin aimed to provide economical and predictable personal transport. Improvements in cell efficiency were soon recognized as essential to making the technology economical. This makes the diesel engine very economical. Corrosion protection of metallic materials is of significant importance on an economical and ecological scale. Natural gas depends on pipelines for economical transport. To do so was regarded as economical and prudent management. Rajkot is in a transition period of growing cultural, industrial and economical activities. These make experimenting and practicing much more economical. However, these obligations were subject to the caveat of being by the most economical means. Bauxites of economical interest must be low in kaolinite. This method was adopted by larger firearm companies for large scale, more economical bluing.