Other changes made to improve fuel economy included modifications to the transmission torque converter to make it "tighter" for more immediate, positive response.Lower axle ratios also helped increase mileage, as did steel-belted radial ply tires, which reduced drag up to 33 percent compared to bias-belted tires.Chrysler's flagship Imperial, however, was in its final year of production, as sales had slipped so badly that it was impossible for product planners to continue the model.Chrysler already had a new exclusive Imperial in planning, and it would arrive in the early eighties. with Filter Change Cadillac made great strides in improving fuel efficiency for 1975.
Among them, the new catalytic converter, installed on Cadillac for the first time in 1975.
In front, the Calais Coupe in Jennifer Blue with optional White padded vinyl roof, and in the rear, the Calais Sedan in Commodore Blue.
Note the new rectangular headlamps and restyled slim wrap-around parking, side marker, and cornering light assembly.
This was an important advancement, as it scrubbed engine emissions outside of the engine—allowing the engine itself to be recalibrated for improved efficiency under varied conditions.
The High Energy Ignition System introduced last year as an option was made standard for 1975, an important advancement in engine performance, reliability, and length between scheduled service.