Gas Milage?

[DADRIV]

I just bought a 2002 Infinity I-35 and LOVE IT!!! However, I think its using to much gas. I'm only getting about 250 Mi. per tank. That isnt right is it. I know I need to do a tune up, but daaazzzaaammnn! Help me out Bro's

Here she is.........I call her "Infinesse" zer...-i-35

[Presscott707]

Is the CEL on right now. O2 sensors could make the gas mileage go down and a bad cat could do it to. Get that tune up done thought if you think it needs it because that could make a little diffidence.

[DADRIV]

Thanks for the advice Presscott. No the CEL isn't on, I'll get back to you after the tune up. How many miles should I expect in your estimation?

[The Siath]

I drive somewhat aggressively mixed 80 highway/20 city and am getting about 21 MPG - however, I drive about 67 miles a day, and only put in $20 per 'fill up' when I get to 1/4 tank (which brings me to just under 3/4 tank) - so I'm never running with a full load of fuel, have nothing 'extra' in the car (very small tool box in trunk, no amps, sub woofer boxes, and not carrying around a bunch of extra crap inside my car either) - AND I know I need a tune up, and need one of my O2 sensors cleaned/replaced...

Edit - forgot to say - I'm in a 99 Nissan Maxima VQ30DE/5MT

[loystock]

DADRIV - You should be getting @ 24 MPG on your I35 at highway speed.

Siath - do not delay replacement of the O2 sensor. The ECM programs the engine to run rich whenever there is a defective O2 sensor.This may cause the other O2 sensors and catalytic converters (very expensive) to fail prematurely.

[DADRIV]

Thanks for the advice. I just filled her up and reset the mileage counter so I can really monitor how much Im getting. I'll update soon

[Amosnorider]

I can easily get 23-24 mph in the city and 27-29 on the highway in my I30. I'm running 18x8 with 235/45 tires. Got one bad O2 sensor as well. I can fill my car up full and get a good 400 mi before the gas light turns on right at 15.5 gal used.