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Re: poor gas mileage diagnosis
Posted by Justin VanAbrahams (more from Justin VanAbrahams) on Wed, 11 Jul 2012 11:57:36
In Reply to: poor gas mileage diagnosis, Duyen, Wed, 11 Jul 2012 11:39:51
Driving habits are *especially* important in older cars, where fuel injection systems run on limited inputs and do a lot of guessing. Better aerodynamics, more gradual changes in speed, and slower freeway cruising can all have dramatic effects on fuel economy. You will also see variation from the ratio of city to highway traffic, too - obviously, cars do much better with steady-state throttle.

But, don't kid yourself - you are driving the heaviest c900 ever made, you aren't going to see fuel economy like an earlier car might. I see high 20s in my '85 SPG, which is on the lighter end of c900s, FWIW.

Make sure your air filter is in good shape, your exhaust isn't plugged, your fuel injectors are in good shape, and your O2 sensor and AMM behaving themselves. And, try driving more gently.



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