When you say you don't "tow much", what does that mean? If you NEVER tow or tow loads that are under 2500#, I'd do what 88Racing says, because you'll never use the towing tune. But, if you DO tow larger weights, you'll want to load a towing tune to do so and if you're throwing lean codes with the canned tunes, you'll need a custom tow tune too.
Next, how much more does hi-test gas cost in your area vs 87 octane? Here, it's about 9% more per gallon. If I were to get an improvement in economy of over 9%, it would pay me to use the expensive stuff. That would mean I'd have to get more than a 1.4mpg increase in highway mileage to make it worthwhile. It's all simple math, and we can't do it for you, since we don't have your driving figures. What's more, we can't predict anything. You may or may not see an improvement in economy by using hi-test - most people do. But, how much improvement is up to you and your truck. With both 87 and 91 octane tunes, you'll be able to figure this out.
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
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