If this is your 'permanet' eco car, then you should do as Dave suggests.
Find a flat piece of land/freeway (should be easy in your neck of ca) and drive 10 miles up and 10 miles back using the gauge and cruise contrl.
Do 50, 55, 60,65 heck even 70.
Now you have a baseline for your car.
I always used the same strip of hiway (when I was in Sacrmento) to test my mods
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