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I'll keep the weight in mind, not only for gas mileage, but also for rotational weight at the corners.
My summer tires were 255/40/17 so the tire size diameter size was 636mm.
I'm wanting to go to 275/30R19 so the tire size diameter size is 648mm.
This will lower the gear ratio, which could cause the feeling of sluggishness off the line. I did imagine the width of the tire would hurt gas mileage, but might not be as bad with the lower gearing ratio?
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