Will a throttle body spacer and jacob mileage master improve mileage or is it a waste of my time and money? On a 1995 F-350 with a 460.

 

Throttle body spacers in EFI engines really don't help anywhere near as much as the claims. I doubt you'd even notice any improvement at all.

Carb spacers when vehicles had carbs actually made a lot of sense and were effective, because the carb would insert fuel into the airstream in "suspension", and having the spacer allowed for the airflow into the intake to make a slightly less sharp turn, thus keeping the fuel suspended in the air before getting sucked into one of the intake runners.

 

Thanks for your reply. I will take your advice and skip it.