I look forward to your results, Simon.
Being that I am a half-way conspiracy nut, I prefer to question the so-called 'expert opinion.' My 1999 Saturn manual trans gets outstanding mileage as is- and I 'just feel and hear' the correct shift. Any older model auto I had driven had no button choice. From the little I drove my 2011 Hyundai with OD off, it felt a much smoother ride in stop go traffic. I will continue to test this. I suppose it will help if I try to average the mileage per tank driving conditions. Thanks.
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