Quote:
Originally Posted by twobjshelbys
My Roush 427IR got about 9 MPG in city, but 12-13 on highway in 5th at 75.
What generation of EFI do you have? If it is the Accel system (older generation) it's going to take a lot more than 2 hours since the tables are not completely populated and it will take time to discover the gaps. As discussed earlier, if that is what you have you would be well advised to switch to another system or go back to the carb version (427R). (under a grand vs 4grand). And a carb will do fine for your usage model.
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It's a 2022. I took delivery 4 months ago in October. SPO3521