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just depends upon situation.
If im evaluating a mod or attempting new best effects mpg.
I always go beyond 1/4 and sometimes to empty warning. because it gets more definative results.
I dont count any result readings under 200 mile either way.
But if I get side tracked and going any which way but loose, I will fill at first cheapest location. The KIA dont get much love from me lol.
I did document months back exxon fuel then Chevron 2 tanks each made better effect in mpg. But this could be results of mixed fuels and also changeover from winter blends to summer blends As I stated then.
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