Gas tank overfill?
#18
On my 2010 Camry I used to top that puppy off all the time for long trips, the car would literally hold almost 2 gallons extra when the pump stops the first time. In 260,000 miles not a single problem with the EVAP system, etc.
-Mike
#19
I've never done this is any one of my cars but my wife has an 08 IS250 and she does this every time. For example, the pump will stop at $33.50 and she will keep going till $35. No spills, no problems till this day.
#20
Lexus Test Driver
I have the habit of filling the tank all the way up the fuel filler neck. I've never had a problem doing this. Some vehicle gas tanks have enough space to take an additional gallon or so, whereas other vehicles (e.g. BMWs) will not take much additional filling.
#21
-Mike
#22
Lead Lap
I'm sure it will most likely be ok. Just as putting 87 octane gas will most likely be ok. Just as putting a different grade of oil will most likely be ok. Etc.
I wouldn't do it just as a precaution but everyone's tolerance to these things are different.
I wouldn't do it just as a precaution but everyone's tolerance to these things are different.
#23
The gas fill thing is, in my book, something that doesn't appear to be immediately provable. It'd be fun to talk to an engineer or someone about this, like someone who knows the internals of the GS's gas tank, etc. I'm going out on a limb here, but I am guessing that Lexus/Toyota has engineered some kind of a protection in there to stop it. It's possible there's an air space in the tank where the evap sensor is and its basically large/high enough that its not possible to "force" gas in there anymore? Or there's some kind of a check valve that closes to prevent any measurable amount of gas from going into the can... ? I've topped off (literally just below the neck) on my 2010 Camry literally dozens of times, and never thrown a code or anything... and the car has 260,000 miles on it.
-Mike
#24
Lead Lap
Except that putting 87 in a car like this is distinctly provable as NOT OK unless its some kind of emergency, IMHO. In every car I've driven that "plate mandates" premium, the car will, in short order, PUNISH you for using lower octane gas. I did it a couple times in my old 2000 Buick Regal GS (had supercharger) and basically the fuel economy dropped by like 4 mpg and the power dropped waaaaaay off. It literally is not worth it- the whole exercise is a fools errand. Maybe you can get away with mixing the fuel- EG, do a mix to just reach 91, yeah, you could probably get away with that, but even that is more of a pain in the *** than its worth.
The gas fill thing is, in my book, something that doesn't appear to be immediately provable. It'd be fun to talk to an engineer or someone about this, like someone who knows the internals of the GS's gas tank, etc. I'm going out on a limb here, but I am guessing that Lexus/Toyota has engineered some kind of a protection in there to stop it. It's possible there's an air space in the tank where the evap sensor is and its basically large/high enough that its not possible to "force" gas in there anymore? Or there's some kind of a check valve that closes to prevent any measurable amount of gas from going into the can... ? I've topped off (literally just below the neck) on my 2010 Camry literally dozens of times, and never thrown a code or anything... and the car has 260,000 miles on it.
-Mike
The gas fill thing is, in my book, something that doesn't appear to be immediately provable. It'd be fun to talk to an engineer or someone about this, like someone who knows the internals of the GS's gas tank, etc. I'm going out on a limb here, but I am guessing that Lexus/Toyota has engineered some kind of a protection in there to stop it. It's possible there's an air space in the tank where the evap sensor is and its basically large/high enough that its not possible to "force" gas in there anymore? Or there's some kind of a check valve that closes to prevent any measurable amount of gas from going into the can... ? I've topped off (literally just below the neck) on my 2010 Camry literally dozens of times, and never thrown a code or anything... and the car has 260,000 miles on it.
-Mike
Anyways, my main point was some people don't want to follow manufacturer guidelines or recommendations and its their call. Your car, your call. You want to top off, go for it. I don't do it. I put California's version of premium and don't top off. You can chose to ignore which ever recommendation you want.
#25
Lexus Test Driver
I'm just curious on the newer Lex vehicles how the evap system works. Maybe they put some kind of a safety mech in it that prevents contamination of the evap system? It seems to be most of the people who said they damaged their car somehow, had cars that were over 10 years old, so I suspect automakers have changed something in the systems involved to prevent this damage. So you do it all the time on your 4GS and no problems?
-Mike
-Mike
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drgrant (08-25-17)
#26
Many people in many cars drive on 87 all the time, many dealers put 87 in cars that require 91 or 93. A friend drove his 535i with 87 for the whole time he had it and never had a problem. It too, like your Camry, never threw a code and he too had over 200,000 miles on it. The computer can adjust itself.
Anyways, my main point was some people don't want to follow manufacturer guidelines or recommendations and its their call. Your car, your call. You want to top off, go for it. I don't do it. I put California's version of premium and don't top off. You can chose to ignore which ever recommendation you want.
-Mike
#27
What is the source for your information? Hearsay or some factual data? I've been filling up to the brim for years with no damage to 3 Lexuses.
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