We have a 2011 Odyssey EXL. It has just shy of 100,000 miles on it. In the last few thousand miles the gas mileage in the city has dropped to 12-15 mpg. We used to get much better gas mileage. Has anyone had a similar experience?
Poor Gas Mileage
odysseypsp
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We have a 2011 Odyssey EXL. It has just shy of 100,000 miles on it. In the last few thousand miles the gas mileage in the city has dropped to 12-15 mpg. We used to get much better gas mileage. Has anyone had a similar experience?
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Worn or contaminated O2 sensors can also cause this. The only way to know for sure is to look at some fuel trims with a live data scan tool.
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Normal for odyssey in hot weather but check filters, tires, tire pressure, alignment, and do any maintenance items that are due at 100k miles if you haven't done so. (ex: spark plugs)
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Ours is a 2012 with ~58k on it and we have not had this issue, but I have not been super impressed with the mpg overall since buying it. We average 17ish for mostly city driving, and have had as high as 25 for highway but that's like a best case scenerio and not the norm. Our old Sienna did better. That said, my last oil change while we were traveling (we live in Pgh PA and were in Malone NY) - they were having a fuel line clean out special for $20 which is supposed to increase MPG and I was like whatever, throw it in - and I did see an improvement after that by a couple miles per gallon. So try some of the tweaks mentioned above and I hope it helps you!
In y'alls shoes, here is the order in which I would check things:
1) air filter
2) air pressure (tires)
3) Spark plug condition
4) engine diagnostics/timing
5) O2 sensor fouling/functionality
I really have a strong sense that, essentially, what you have, is failed 'routine maintenance'. If you don't have CELs, then none of your specific failures have exceeded the system 'thresholds' (ie. none of your diagnostics have 'thrown' a 'code') which implies that the poor fuel economy is a combination of several of the above, none being bad enough to throw codes, but all contributing to the problem...
IDK, obv it's not my vehicle, so I could be completely off track, but that's my feeling on it.
1) air filter
2) air pressure (tires)
3) Spark plug condition
4) engine diagnostics/timing
5) O2 sensor fouling/functionality
I really have a strong sense that, essentially, what you have, is failed 'routine maintenance'. If you don't have CELs, then none of your specific failures have exceeded the system 'thresholds' (ie. none of your diagnostics have 'thrown' a 'code') which implies that the poor fuel economy is a combination of several of the above, none being bad enough to throw codes, but all contributing to the problem...
IDK, obv it's not my vehicle, so I could be completely off track, but that's my feeling on it.
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Totally agree. The computer will add up to 25% more fuel to correct for a problem that it sees before you'll get a check engine light. A quick diagnostic check of fuel trims with an inexpensive live data scan tool will tell you right away if there is an issue with the computer adding fuel.
Could be anything from a squirrel nest in the cold air intake to low compression in the engine and a thousand things in-between. All the things the others have mentioned are worthy of checking. Have you been buying gas from the same place during the last few thousand miles? If so, start buying at a tier 1/different station, like Shell or Exxon. Use Extra or Premium for awhile to take advantage of the cleaners in the gas. Try to be a little heavier-footed where possible to help clean everything out. Have you had an oil change over the last few thousand miles? Just curious if you're still using the recommended viscosity and if you trust the guys that do your changes. Do you check your oil regularly?
Dirty Mass Air Sensor, dirty throttle body, dirty injectors, worn ignition parts (plugs, coils), clogged air filter, etc., etc. there are at least a million possibilities.
Dirty Mass Air Sensor, dirty throttle body, dirty injectors, worn ignition parts (plugs, coils), clogged air filter, etc., etc. there are at least a million possibilities.
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