Bad Gas Mileage.??? Getting Worse
#21
Contributing Member
Have you had someone check the O2 parameters yet? From your earlier posts you have not yet changed your plugs/wires. Try that first anyways if it's due in mileage. As said before ONLY use NGKs or Denso. You will regret it if not and pay twice for it. I'm consistently getting 15.2 MPGs but I'm running 31's and have not calibrated for the larger tire sizes so I'm actually getting a false record in MPGs. Also my driving habits are much more aggressive (jack rabbit starts, in a hurry to get home, etc) so I'm creating my own low MPGs.
#22
Check your speedo/Odometer with a GPS to make sure it is accurate. It may or may not be. My speedo is a consistent 5mph off. My accord is 3 percent off on odometer.
Anyway, I get about 13 in the city and about 18-20 on the freeway below 65. At 75 it drops to 15. At 85 it drops to 13.
I am a lead foot and don't really care about mileage between 13 and 18.
I wouldn't get crazy about replacing parts unless you can prove their is a problem. Spark plugs are cheap, but coils are not. Coils can be tested.
You can spend hundreds if not thousands to chase down a bucks in gas.
Anyway, I get about 13 in the city and about 18-20 on the freeway below 65. At 75 it drops to 15. At 85 it drops to 13.
I am a lead foot and don't really care about mileage between 13 and 18.
I wouldn't get crazy about replacing parts unless you can prove their is a problem. Spark plugs are cheap, but coils are not. Coils can be tested.
You can spend hundreds if not thousands to chase down a bucks in gas.
#25
..... i mean i've said just about everything and you have claimed an ok on everythign so yea..... i dunno what to tell you. do a tune-up or somethin check into it further.... unless you got something freakin crazy wrong like a bent rear axle or something....
#26
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when i had my 84 pickup with a 22RE i had a straight back exhaust with no cat and a glasspack under the bed and untill i put an 02 sensor in, i was getting the same results. even with resetting the computer, it was just going off the default mode and just dumping fuel needlessly. i'd check the 02 sensor if you haven't already.
#27
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so smallwood, did you ever get your mpg up? I'm barely getting 200 miles per tank these days and it's killing me. I need to know if it's just a desperately needed tune up or if something is seriously wrong. I wanna get back up to about 16 and 17 range. What size gallon tank is on the 3rd gens.. 16 or so?
#28
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You have probably thought of this, but here's my $.02:
How about this: Bigger tires = greater circumference. That would mean you actually travel further per tire revolution. Your speedo has been calibrated for stock tires.
Here are some numbers: http://www.tiretrends.com/pdf/BFG/AllTerrainKO.pdf
Have a look at revs/mile.
265/70-16 = 678
265/75-16 = 654
That's a 3.6% difference. If you were getting 19 mpg, without doing the conversion, your speedo would show you only getting 18 mpg.
If your old tires were worn out, the difference would be greater than 3.6% because the revs/mile will increase as the tread wears out.
Bruce in Tsawwassen
A2B in a Toyota Land Cruiser
How about this: Bigger tires = greater circumference. That would mean you actually travel further per tire revolution. Your speedo has been calibrated for stock tires.
Here are some numbers: http://www.tiretrends.com/pdf/BFG/AllTerrainKO.pdf
Have a look at revs/mile.
265/70-16 = 678
265/75-16 = 654
That's a 3.6% difference. If you were getting 19 mpg, without doing the conversion, your speedo would show you only getting 18 mpg.
If your old tires were worn out, the difference would be greater than 3.6% because the revs/mile will increase as the tread wears out.
Bruce in Tsawwassen
A2B in a Toyota Land Cruiser
#30
so smallwood, did you ever get your mpg up? I'm barely getting 200 miles per tank these days and it's killing me. I need to know if it's just a desperately needed tune up or if something is seriously wrong. I wanna get back up to about 16 and 17 range. What size gallon tank is on the 3rd gens.. 16 or so?
#31
Registered User
You have probably thought of this, but here's my $.02:
How about this: Bigger tires = greater circumference. That would mean you actually travel further per tire revolution. Your speedo has been calibrated for stock tires.
Here are some numbers: http://www.tiretrends.com/pdf/BFG/AllTerrainKO.pdf
Have a look at revs/mile.
265/70-16 = 678
265/75-16 = 654
That's a 3.6% difference. If you were getting 19 mpg, without doing the conversion, your speedo would show you only getting 18 mpg.
If your old tires were worn out, the difference would be greater than 3.6% because the revs/mile will increase as the tread wears out.
Bruce in Tsawwassen
A2B in a Toyota Land Cruiser
How about this: Bigger tires = greater circumference. That would mean you actually travel further per tire revolution. Your speedo has been calibrated for stock tires.
Here are some numbers: http://www.tiretrends.com/pdf/BFG/AllTerrainKO.pdf
Have a look at revs/mile.
265/70-16 = 678
265/75-16 = 654
That's a 3.6% difference. If you were getting 19 mpg, without doing the conversion, your speedo would show you only getting 18 mpg.
If your old tires were worn out, the difference would be greater than 3.6% because the revs/mile will increase as the tread wears out.
Bruce in Tsawwassen
A2B in a Toyota Land Cruiser
#32
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well I think my gas gauge sensor is messed up because I can be on 'e' turn it off and back on and it be close to half. But thats not my problem cus It can show half after being on 'e' all day and I can still fill up to around 16 gallons. I still need to find out why I'm only getting 10-12.
#34
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Where did you find the vacuum leak? Which hoses do you check? I'm having the same issue with bad gas mileage, even after some new sparkplugs. With normal driving I'm only getting about 250 kilometres or 155 miles per tank.
#35
Registered User
You can find vacuum leaks by opening a propane bottle so it lets out just a little gas and moving it around the engine while it's idling. If the idle changes, the leak is going to be in the area of wherever your propane bottle is at the time.
I had a miss for a long time on my truck and was getting about 10-11 mpgs for the last couple months so I did an machine-based induction cleaning and my mpgs have gone back up to 16-18 and my engine runs much smoother now. My write-up is a little long, but it may help you. I know you're not talking about a missing cylinder and our problems aren't exactly the same, but this could (and most likely will) restore your fuel mileage...
http://www.toyota-4runner.org/3rd-ge...hopefully.html
I had a miss for a long time on my truck and was getting about 10-11 mpgs for the last couple months so I did an machine-based induction cleaning and my mpgs have gone back up to 16-18 and my engine runs much smoother now. My write-up is a little long, but it may help you. I know you're not talking about a missing cylinder and our problems aren't exactly the same, but this could (and most likely will) restore your fuel mileage...
http://www.toyota-4runner.org/3rd-ge...hopefully.html
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