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I am currently the only driver of both. I work from home, so the cars makes the same trips…out my rd, & in 2 minutes on the highway. Go 7 miles, get off & go about 1 miles on farm roads to drop my son at school. Hes getting his license in a few months which is why we bought the 2nd car. My son probably gets better gas mileage than me in both cars, but the 04 gets bad mileage regardless of who’s driving. That’s pretty much the only driving we do. The store is near his school, & I can walk to stuff in my town. I drive 25 min (about 30 miles each way) on the highway once a week to rehearsal, but that’s a straight road all the way, quite flat, & I set the cruise control & sail on down.
I agree about the throttle situation. The noise is more of a whine the changes pitch up & down as you depress the gas & let it up. It “whines” constantly. It mildly sounds like a belt, only bec ause I the cyclical sound the whining makes. The 2004 idles at about the 1/2 mark (5000rpm), sometimes higher, where as the 1999 ifles very low, at around 250-300rpm. Ive tested on the highway….the 2004 is at 3000rpms by sbout 74mph, where as the 1999 has to get up to 83mph to hit 3000rpm. So at 80 mph, my older car is quiter. So im thinking this slightly higher idle is eating gas. I had read on this site awhile back, there was a video of someones whining engine that sounds exactly like mine. He changed the alternator in the video & the noise went away completely. Thats the only reason I thpught alternator on that, but im not convinced it would destroy my gas mileage that bad. Still wondering about this after market cat…it hasnt set the cel but he thinks it will. We did get one internal code on the CAT once, & he said when the 2nd internal code is tripped the cel will come on. He thought that should have happened already. I did just have a cel but I came up at a code for the thermostat because the 2 upstream o2 sensors were bad. Replaced both, no more cel, but it did not improve my mileage at all. So there’s something else going on. Vacuum leak is possible. ..I do have a tiny, almost unnoticable oil leak way down low, closer to ground level than top or middle of the block.
I agree about the throttle situation. The noise is more of a whine the changes pitch up & down as you depress the gas & let it up. It “whines” constantly. It mildly sounds like a belt, only bec ause I the cyclical sound the whining makes. The 2004 idles at about the 1/2 mark (5000rpm), sometimes higher, where as the 1999 ifles very low, at around 250-300rpm. Ive tested on the highway….the 2004 is at 3000rpms by sbout 74mph, where as the 1999 has to get up to 83mph to hit 3000rpm. So at 80 mph, my older car is quiter. So im thinking this slightly higher idle is eating gas. I had read on this site awhile back, there was a video of someones whining engine that sounds exactly like mine. He changed the alternator in the video & the noise went away completely. Thats the only reason I thpught alternator on that, but im not convinced it would destroy my gas mileage that bad. Still wondering about this after market cat…it hasnt set the cel but he thinks it will. We did get one internal code on the CAT once, & he said when the 2nd internal code is tripped the cel will come on. He thought that should have happened already. I did just have a cel but I came up at a code for the thermostat because the 2 upstream o2 sensors were bad. Replaced both, no more cel, but it did not improve my mileage at all. So there’s something else going on. Vacuum leak is possible. ..I do have a tiny, almost unnoticable oil leak way down low, closer to ground level than top or middle of the block.
The 1999 gets 24mpg or about 340-370 miles per tank. The 2004 is getting 15.5 or about 240 miles per tank. All highway miles. Same specs. There’s no way my 2 cars would show a 10mpg discrepancy without something mechanical going on.
Looking for actual mechanical explanations. Not ignorant condescending suggestions. If it were that easy, I wouldn’t be posting here! Would I.
The 1999 gets 24mpg or about 340-370 miles per tank. The 2004 is getting 15.5 or about 240 miles per tank. All highway miles. Same specs. There’s no way my 2 cars would show a 10mpg discrepancy without something mechanical going on.
Looking for actual mechanical explanations. Not ignorant condescending suggestions. If it were that easy, I wouldn’t be posting here! Would I.
Ya, NO. did u read the whole thread? I have the exact same car but older. The newer one gets 10mpg LESS than the exact same car 5 years older. Try again.
Ya, NO. did u read the whole thread? I have the exact same car but older. The newer one gets 10mpg LESS than the exact same car 5 years older. Try again.
It does seem to run higher rpms just slightly. I also notice a mild wrirling noise the 1999 doesn’t make. It seems to be tied to the throttle. I read a bad alternator can make the noise I hear, bit not sure the alternator would cut gas mileage by almost 10mpg. I have not checked the brakes, but wouldn’t they have noticed when they put the new tires on & balanced & aligned?
Oh, new air filter too
It does seem to run higher rpms just slightly. I also notice a mild wrirling noise the 1999 doesn’t make. It seems to be tied to the throttle. I read a bad alternator can make the noise I hear, bit not sure the alternator would cut gas mileage by almost 10mpg. I have not checked the brakes, but wouldn’t they have noticed when they put the new tires on & balanced & aligned?
Oh, new air filter too
Yes, I’ve checked the odometer & its reading correctly. The math says my 2004 is getting 15.5mpg & the older car is getting about 24mpg. So a rather big difference.
Yes, I’ve checked the odometer & its reading correctly. The math says my 2004 is getting 15.5mpg & the older car is getting about 24mpg. So a rather big difference.