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Modified 5.7 mileage est?

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Old Jan 7, 2026 | 11:24 AM
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Default Modified 5.7 mileage est?

Btr stage 3, 243 rebuilt heads, milled.
Lt headers 3in exhaust true duals
Ls6 intake 92 mm tb auto 3400 stall
Is it feasible to road trip 700 mi.?
Anybody try something like this?
Any insight appreciated, thanks!
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Old Jan 7, 2026 | 05:56 PM
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From: Dade City, Fl.
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What vehicle? What rear gear? What would the RPM be for the majority of the trip? My engine is similar to yours in a '71 Camaro w/3.42 ratio. I haven't driven on a long trip yet but, combined mpg's (while trying to keep my foot out of it) I am seeing between 18 and 19.
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Old Jan 8, 2026 | 04:12 AM
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From: colorado,usa
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Vehicle Make ?
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Old Jan 8, 2026 | 04:13 AM
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From: colorado,usa
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Pictures would help
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Old Jan 8, 2026 | 07:19 AM
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02 ta ws6 rear gear is stock for auto, think it's 3:23
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