What is the recommended spark-gap? If gapped wrong would this decrease m/p/g? on 2008 Dodge Avenger

It is gapped at 35. Still cranks hard.

Asked by for the 2008 Dodge Avenger
Have fuel pressure tested.
2 more answers , 2 more comments
yes. poor gap can effect MPG. possible start system issue. examine ignition coils for damage(charring on boots). still fires up though right?
It still fires up....I will check for damage...Tank you!!!
look in the engine compartment it has the spark gap on the hood, strut tower or by the radiator. hard crank might be low battery or starter going bad
Thank you!