Have a question about Gas mileage, my engine and few mods are in my sig and I seem to get about 130 miles to a tank (according to the odometer) and it costs me like $21-$23 to fill the tank, which is draining me pretty good, does this seem right and im just not used to this motor yet? my iroc was only a 305TBI stock so i guess its a pretty good change.. the car does need a tuneup does this effect it?

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1991 Camaro Z28
350 TPI, Edelbrock Headers, Edelbrock Intake Runners, Flowmaster Muffler, Hypertech Power Chip (160 Deg Thermo), K&N Air Filter
Q-Logic Dual 10" Bandpass Subwoofer Enclosure
2 10" MTX Thunder 7000 Subwoofers
Rockford 250a2 Amplifier
Infinity Kappa 4x6" plate & 6x9's
Visit my website/see pics at: http://slayer6669.homestead.com

 

Most (if not all) of the mods you've done should increase gas mileage.. Of course this also depends on how heavy your foot is.

A tuneup would definately help gas mileage.

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89 iroc-z
everything stock, except for a mirror that fell off