I have a bad gas mileage, how about yours ??
#106
One thing i would recommend for any car of any age is a decent Earth wire to the real earth the engine not the chassis. Just adding a real earth generally give more power to older cars that may have brittle earths. As far as fuel consumption goes with a heavy car and a small v6 engine i dont expect to ever get a real good fuel ecconomy that being said it has a lot more pep than some other awd/4wds etc only because they all fall into same bracket.
I'm an electrical enginner and would love to learn something new, please explain.
#107
Driver School Candidate
Old thread sticky'd
I have a 2000 RX300
I do mostly city driving but occasionally highway drives occur.
I was averaging around 18+ per tank in the summer and sometimes getting nearly 300 off a full tank
Now with winter hitting, I am closer to 17 avg and filling the tank around 250
This thing just has a small tank in general. On the highway, I get approx what I expected. At 65mph, It shows around 23-24 mpg.
I have a 2000 RX300
I do mostly city driving but occasionally highway drives occur.
I was averaging around 18+ per tank in the summer and sometimes getting nearly 300 off a full tank
Now with winter hitting, I am closer to 17 avg and filling the tank around 250
This thing just has a small tank in general. On the highway, I get approx what I expected. At 65mph, It shows around 23-24 mpg.
#108
This thing just has a small tank in general.
I usually go around 300 miles between refills. I've been trying to get up to 400 miles, but usually chicken out when the gas light has been on for awhile... I think the max I can remember going is 385 miles.
A lot of it is highway driving, and yes, it is common to have poorer fuel economy with colder weather.
#111
'99 AWD gets 22-23 mpg hwy, 16 or so in city. It dropped down to 14 over the past few months and I changed the front rotors and pads and wire brushed everything thoroughly. Also, cleaned and lubed the caliper slide pin bolts. Finally, I put in Sea Foam in a full tank of gas (about 1/2 can). Now it's getting 16-17 city again on regular.
#113
I should have done the SeaFoam separately, to be sure. I think after about 130k on the original rotors they were beginning to warp & rust internally. You could feel shimmying when I braked. Now it's smooth braking!
I have used SeaFoam on other vehicles and it really cleans the engine nicely. Seemed to run smoother. I just put about a half can in the fuel with a full tank. But read the directions... to be sure.
Here is the type. Most auto stores as well as Walmart have it.
I do have a drop in K&N Air Filter... which I think lets the engine breathe better.
Next on the agenda would be to replace the plug wires. Not that it's not running smoothly, but they are old.
Last edited by C-Stone; 03-08-11 at 05:09 PM.
#114
Lexus Test Driver
I think seafoam is most effective when done through the brake booster line. Well atleast that's what i've heard, i haven't done it yet to the rx300, i figure why fix something that's not broken.
#115
1. It seems reviews are mixed on doing the booster line on these RX's. Do a search on this and you'll find it. So I also have hesitated to try it on these cars.
2. The 1/3 can in a full tank of fuel is easy and I think does a fine job.
3. The 1/3 can in the oil may be an option, but you only leave it in for a drive and then change the oil. ... they say. I haven't tried it on any car, yet.
One can Youtube "Seafoam" and see a bunch of smoking vehicles being cleaned out of carbon deposits.
#116
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Another thing that greatly affects mileage is just your driving style. I know that when I drive my '01, I usually get about 18 city and 22 highway, but when I let one of my friends drive it, he usually likes to open the throttle a bit more than I do, and it usually averages about 12-13 when he drives it. It all just depends on how you like to drive that really has the biggest affect on the MPG
#118
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#119
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My RX300 got about 24mpg on the highway a couple of years ago. I noticed that the mpg dropped off. I did the same things: spark plugs, oil, air filter. My mileage improved after using some injector cleaner and changing out the ignition coils. Hold on to your wallet though, because those coils are expensive!
#120
I've got a 2002 2WD RX 300 that's currently averaging 20.3 on regular. I do not use premium even though it is recommended. When I first bought the RX, the display read 19.4, but then again, I curb my lead foot tendencies and drive it like a senior citizen and stay out of the passing lane.