If you got your carb and distributor dialed in at cruise I would expect the same mileage. However the tbi/ megasquirt system will instantly adjust for all other conditions. So overall you will see significantly better mileage overall. Carbs have three modes: idle, cruise and power. Tbi have infinite modes.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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