Quote:
Originally Posted by berfinroy
The 4.5 used exclusively for the American market beginning in 1972 is known for its lousy gas mileage.....around 14 mpg on average.
I suppose its a combination of things like lower compression (8:1 vs the preceding 3.5s 9.5:1), less than ideal camshaft and ignition timing, use of a torque converter transmission instead of the more efficient (but rougher) hydramatic style torus coupling and the inherent poor aerodynamics of the W108/109 body design.
But STILL.....
Any tips on how to improve on this? Without spending 20 years worth of potential gas money savings on extensive modifications?
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If the car is used 12,000+ miles per year, an engine upgrade to 10:1 w/ appropriate valve timing, aftermarket ECU w/ wideband O2 feedback, and tall gears could be a win.
If the car is a hangar queen, upgrades are indeed a loser.