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...ENGINE TUNE & FUEL...I only use “Top Tier” fuel...
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Not always true that top tier fuel is better. Sometimes the fuel is made to same spec as a top tier fuel. One of the bigger questions is if you will get an improvement by not using ethanol. If the non-ethanol fuel use something else to oxigenate with you might gain 10% over ethanol enhanced fuels.
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Avoid letting the vehicle idle (to heat-up). The best way to warm the engine is to start it and go! Just keep the rpm low until you reach operating temp.
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Not always true and when towing a heavy load you are putting quite a strain on a cold engine.
One other tip is to use your cruise control. Some vehicles have cruise controls that know how to handle towing conditions (wish my Taco did). When I am on level turf my cruise control allows me to manage my MPG much better than I can with my foot.
Mountains are a tougher matter. It generally takes some a little foot bias and cruise disengagement/re-engagement to improve fuel economy...