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Old 09-08-2014, 08:28 AM
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Gear and Speed

I wanted to know with the 3.8L with 6 spd manual on true 35 inch tires what the rpm would be @70mph in 6th gear with 4.88 and also 5.13.

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Old 09-08-2014, 08:58 AM   #2
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At 70 I'm usually at 2.6-3k Rpms. 3.8/5.13/37's

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Old 09-08-2014, 10:58 AM   #3
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There is a chart like this out there for a 6 speed
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Old 09-08-2014, 01:52 PM
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Okay, So im assuming the green columns would be the best gas mileage than the blue. Now this chart is based on 70mph if I keep it at 65mph would the 4.88 blue in the Manual Tranny section for 35 tires go to green as far a rpms go.
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Old 09-08-2014, 04:09 PM   #5
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Your gas mileage probably won't be affected enough to make much of a difference depending on how much highway driving you do. The added unsprung weight should have a much higher affect on highway performance.

How often you drive 70mph vs needing low end torque should determine 4.56/4.88/5.13
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Old 09-08-2014, 06:18 PM   #6
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They yellow band is selected for fuel economy, the green for balance fuel economy/performance and the blue for performance. Keep in mind these are guidelines since the definition of performance is highly subjective.

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