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As the title says, this may not be possible but I'm looking to get the most HP/Torque while attaining the highest MPG. I've tuned diesel cars and gas trucks in the past, both of which have seen increased power/torque and increased MPG post tune.

The only items replaced on my car are Green filter and straight pipe with catted stock DP and just replaced the tires with Michelin Primacys . If I change plugs and run a tune, will gas mileage suffer? Are there any things I can do to squeak out efficiency aside from changing to full synthetic?

91 octane only in my area, I've got a light-ish foot, but like to have fun every now and then...
 

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As the title says, this may not be possible but I'm looking to get the most HP/Torque while attaining the highest MPG. I've tuned diesel cars and gas trucks in the past, both of which have seen increased power/torque and increased MPG post tune.

The only items replaced on my car are Green filter and straight pipe with catted stock DP and just replaced the tires with Michelin Primacys . If I change plugs and run a tune, will gas mileage suffer? Are there any things I can do to squeak out efficiency aside from changing to full synthetic?

91 octane only in my area, I've got a light-ish foot, but like to have fun every now and then...
Honestly it's your right foot that controls the most. You can see all my mods below and even on my E30 tune I can milk out 30+ mpg's. On that note driving like I normally do (like and a-hole) I average 26-28. Our cars don't like to be over 75mph for gas mileage. You need to keep it close to 65-70 to maximize mpg's.
 
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