Lexussc400Sugarland Posted June 15, 2004 Share Posted June 15, 2004 i need tips for a sc400 on how to improve the mileage ive already changed the plugs and wire with recommended lexus plugs and wires and new tires and i drive normal sometimes the worst mileage ive gotton is 10 miles pergallon i look at normal 15 miles pergallon i want 20 -22 i need tips on what to do ill do anything :( Quote Link to comment Share on other sites More sharing options...
Calvin L Posted June 15, 2004 Share Posted June 15, 2004 try replacing your fuel filter, getting a tune up, your 02 sensor could be bad, try not to drive so "spiritedly" try to drive on the highway more to get where you need to get. thats all i can think of for now. check back with you later. see what these things can do for you. Quote Link to comment Share on other sites More sharing options...
Lexussc400Sugarland Posted June 15, 2004 Author Share Posted June 15, 2004 thanks ill change my fuel filter and see how much an o2 sensor and replace it Should i replace my intake??? Quote Link to comment Share on other sites More sharing options...
sightdev Posted June 15, 2004 Share Posted June 15, 2004 I average 20mpg with plenty of spirited driving in Washington DC area so I am really impressed with the mileage. I think many of the forum members here claim mid 20s with mix mode (hard to believe) but if you are getting low 10’s, either your car is not in good condition or your right foot is really heavy. Since you have done your usual plugs/wire, have you done your air filter and cap/rotor? Air filter makes a noticeable difference if the current filter is really dirty. Inflate your tire to manufacture recommendation of 35 psi, I use to run with 30 psi for comfort but with recent gas price increase I reverted back to 35psi. I have done few things to maximize the efficiency and still averaging 20 mpg but my SC is the best mileage vehicle I own so I don’t rant too much with $30+ fill-up. Quote Link to comment Share on other sites More sharing options...
Lexussc400Sugarland Posted June 16, 2004 Author Share Posted June 16, 2004 well i ve never have gotton 20 or close to it untill i did a atrip to dallas i got 20 mpg i dont know what could be wrong 250 miles a tank is my average and i think im goin to do the 02 sensor that should help along with a fuel filter change Quote Link to comment Share on other sites More sharing options...
blueviol Posted June 16, 2004 Share Posted June 16, 2004 Well, I used to get about 19-20 MPG for my daily 50 mile roundtrip commute. Then since I upgraded to the K&N Intake (cone-type air filter) for mere $70 from eBay, I am getting 22MPG!! I mean it! From a full tank, after a usual 400+ miles run, the fill up takes about 18.5 gallons. During a round trip between DC and NJ (250 each way), I scored 25MPG. Though that's hard to accomplish from my daily commute, there is definitely a vast improvement. Quote Link to comment Share on other sites More sharing options...
psolov Posted June 16, 2004 Share Posted June 16, 2004 My SC400 gets about 22mpg and it has 223k miles. The only thing I did was a tune up @120K miles. I'd check the filters, tire pressure, etc... If that doesn't work I'd put it on 'puter and see what it tells you. Paul 02 SC430 00 RX300 95 SC400 Quote Link to comment Share on other sites More sharing options...
SCdriver Posted June 16, 2004 Share Posted June 16, 2004 I get 24-27mpg on long highway trips. I have NGK iridium spark plugs, a Ram FX foam filter, properly inflated Goodyear Eagle F1 tires and use chevron techron fuel additive every 6,000 miles and keep the overdrive button on the shifter on to improve highway mileage. City driving mileage is 14-17mpg. I use Mobil one oil and nippon or advantex oil filters. If your mileage is very low check to see that your overdrive is on which decreases your rpm at highway speeds and try adding 20 0z of techron fuel additive when you fill your tank to clean your intake ,valves and injectors. Quote Link to comment Share on other sites More sharing options...
grnsc40095 Posted June 16, 2004 Share Posted June 16, 2004 Lexussc400Sugarland, Assuming your Lexus is high in mileage, I would try using a engine\fuel treatment, which cleans the Cylinders\Pistons and fuel injector. I've been using a product called ZMax on my Sc400 and it has improved my fuel mileage. Quote Link to comment Share on other sites More sharing options...
wilhunt Posted July 31, 2004 Share Posted July 31, 2004 I am a moderate driver with short spurts thinking I am Jaun Fangio. 1997 SC400 K & N, Amsoil, 32 # tire pressure. 18-20 in town with 22-25 hiway at 75 mph ave. Quote Link to comment Share on other sites More sharing options...
heyduh328 Posted July 31, 2004 Share Posted July 31, 2004 i have a 93 sc400 with 110k .... i get 350 to 370 miles to the tank... DC driving including a killer 2hr/day bumper to bumper commute on the beltway Quote Link to comment Share on other sites More sharing options...
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