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Yup, correct.
You can also use the gauge to fine-tune your driving, then sell it later. But it's really worth the money - first time you have to read / reset a check-engine light, you'll be glad you have it.
Also: what mods have you done / do you have planned? With the majority of your driving being highway, there are a number of cheap (or free) and easy aero mods you can do, eg. a partial grille block.
Welcome to the forum!
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