Original sentence: Electra Limited models also got power windows and 2-way driver's seat as standard equipment, along with an optional leather upholstery trim, the first Buicks (along with that year's Riviera) to offer real hide seats since the 1963 Riviera.Leather upholstery became an extra cost option on the Electra Limited models beginning in 1974, when that trim-level models also gained power windows and driver's seat as standard equipment.Optional driver and passenger airbags were also available in 1974, but unpopular due to their cost; a crude version of traction control called Max Trac was an option as well
Edited sentence: Axle ratios were also numerically lowered to aid in improving gas mileage.Electra Limited models also got power windows and power driver's seat as standard equipment, along with an optional leather upholstery trim, the first Buicks (along with that year's Riviera) to offer real hide seats since the 1963 Riviera.Optional driver and passenger airbags were also available from 1974 to 1976, but unpopular due to their cost.Technical changes for 1975 included the addition of a catalytic converter and electronic ignition to not only meet the stringent 1975 and later emission requirements, but also extended routine maintenance intervals, and improved fuel economy and driveability which was a must in the era immediately following the 1973-74 energy crisis, but also spelled the end of dual exhaust systems and mandated the use of unleaded gasoline as the converter could be rendered useless if contaminated with lead.The 455 four-barrel V8, now rated at 205 horsepower, was retained as the standard and only available engine