Gas station sticker shock

Titan owner: 2006 Nissan Titan 4x4 200,000km (120,000miles) fuel milage

Hey all, I'm averaging 350km a tank (aprox: 217miles), which is just over 7mpg in the city.

How can I improve this? Is theres a tune-up program I can flash the ecu with?

Intelligent Tinkering: I don't know if this is what you're doing, and apologies if not, but it's often a math error to drive an unloaded big truck for every little errand because you think you can't afford a second, more efficient vehicle. "Buy a Prius" is perhaps intended as funny or even a snarky jab, but the basic reasoning is (paradoxically) correct. Try a "round numbers" thought experiment: If you're doing 10K miles a year at 10mpg, you're spending, say, between $3 and 4K on fuel, depending on market price and different state taxes. If you could instead get 30mpg for half that 10K miles, that would be between $1340 and $1500 less per year to pay for something cheaper. In Maine a running "econobox" with some dings but also some miles left on it might run $5K, so if it ran for three years more it would (roughly) pay for itself and any subsequent years would be gravy. This assumes you're an old fart like me with no tickets or claims and your insurance is dirt cheap, that you can identify a good econobox in the marketplace and avoid a lemon, and you can fix the thing yourself. The repair costs on the Titan for that extra 5k miles are likely to be double that of the econobox in any case, so even if you can't fix it it's still a savings. I put less than 3k miles a year on the Titan, mostly for hauling and plowing snow. My 97 Camry does around 5K. The Camry, which cost $3,500 in 2011 with only 44,000 miles, finished paying for itself about ten years ago, doesn't owe me a penny, and by my lights still has a 100,000 or more left to go. Because it's easy to maintain shifting wear to the Camry gives me extra time to take better care of the Titan. Because this is Maine, when you need it, you need it. Having it cost less helps a good deal. My particular masculine ego doesn't need a big truck to go to the hardware store. It does need one to plow the snow from my driveway so my wife can get to work and my kid get to school (and the frigging mail lady can deliver all the wicked high bills I have to pay).