We own a 2007 TL Type S (automatic). We dont drive the car hard at all. The gas mileage we get is not bad but we are just wondering if there is any performance mods you guys are installing that result in getting better MPG other than weight reduction.

If not, no big deal just wanted to know. Thank you for your time and info.

 

My brother owns the same car and i was wondering when you fill the tank up to full from empty.. how many gallons does it show. They say the fuel capacity is 17 gallons but we've never been able to fill it past 12 gallons

 

Cruise control when you can makes a nice improvement in MPG. The only mod I know of that might help gas mileage is a Sprint throttle controller that basically delays throttle inputs to slow you down.

 

We use cruise control every chance we get.

 

The car still has about 4 gals of gas when the light comes on. The fuel pump is submerged in the fuel and uses it for cooling, so it retains this fuel for that purpose and to give you a nice reserve. This extra gas will get you 100+ miles many times.

 

The car only has 3 gallons when the light comes on I believe. Higher PSi on tires especially in the winter, higher width tires, exhaust mods?, and less braking and more de-accelerating.

 

If you are @ 90K+ miles on the car replace your primary O2 sensors, just like any other sensor they lose thier acuracy over time and with O2 sensors they usually lose acuracy towards the rich side.

Now when replacing the sensors, ONLY USE DENSO OR NGK SENSORS, it has been my experienc that Bosch O2 sensors are much slower responding to AFR changes and will cause the ECU to not be as accurate on fueling, also www.rockauto.com seems to have the best pricing for the sensors.

 

The usual stuff like tire pressure. Exhaust. Not intake lol.

Remember that whenever you let off the throttle and the rpms are above 1,000 the fuel injectors are shut off completely. Those with a manual don't push the clutch in when coasting, leave it in gear. With the auto it will usually downshift as you're slowing keeping it in fuel cut mode.

Autos are different than manuals. The torque convertor gets more efficient as you give it more throttle and rpm. If you give it just enough throttle to keep from getting run over, a lot of your energy is being wasted in torque convertor slip and heat. In an auto you want to get up to your cruising speed in a timely manner and then back off. The TL locks the convertor so at what ever speed it locks at, you now have a direct coupling like a manual.