True Gas Mileage figures for IS250C and IS350C
01-26-18, 09:29 PM
#1
Driver
Thread Starter
True Gas Mileage figures for IS250C and IS350C
I didn't see a sticky or thread on actual gas mileage figures for IS250C and IS350C models. My wife and I plan on purchasing one in the next few months. I would like the 350's additional power over the 250's if it doesn't penalize me to much... I would appreciate some real world numbers. Thanks!
01-28-18, 12:11 AM
#5
Don't settle for a 250 with the crap 2.5 liter V6. Gets the same gas mileage as the 3.5 liter V6 but makes 100 less hp. The 2.5 liter V6 also has serious problems with carbon buildup in the cylinders, which can be very pricey to fix out of warranty(think taking the heads off or total engine replacement type of expensive).
01-28-18, 12:22 AM
#6
Don't settle for a 250 with the crap 2.5 liter V6. Gets the same gas mileage as the 3.5 liter V6 but makes 100 less hp. The 2.5 liter V6 also has serious problems with carbon buildup in the cylinders, which can be very pricey to fix out of warranty(think taking the heads off or total engine replacement type of expensive).
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01-28-18, 10:12 AM
#9
I cannot comment on routine fuel consumption as my IS250C is not used regularly and also our gallons here in the UK and bigger than yours in the US. Strange, I thought everything in the US was bigger.
On a long run with the display zero'd at start, I get 35 or so, equivalent to 28 for your US gallon.
The 350 was never an option in the UK but the 250 has adequate power and is lovely and smooth. It's a Lexus so who would want to beat the **** out of it?
On a long run with the display zero'd at start, I get 35 or so, equivalent to 28 for your US gallon.
The 350 was never an option in the UK but the 250 has adequate power and is lovely and smooth. It's a Lexus so who would want to beat the **** out of it?
01-28-18, 02:49 PM
#10
I cannot comment on routine fuel consumption as my IS250C is not used regularly and also our gallons here in the UK and bigger than yours in the US. Strange, I thought everything in the US was bigger.
On a long run with the display zero'd at start, I get 35 or so, equivalent to 28 for your US gallon.
The 350 was never an option in the UK but the 250 has adequate power and is lovely and smooth. It's a Lexus so who would want to beat the **** out of it?
On a long run with the display zero'd at start, I get 35 or so, equivalent to 28 for your US gallon.
The 350 was never an option in the UK but the 250 has adequate power and is lovely and smooth. It's a Lexus so who would want to beat the **** out of it?
01-29-18, 01:08 AM
#11
Aron, I have no doubt that you are right.
Lexus sold their cars to the UK with smaller engines - no doubt as our gas at the pumps is twice the price of yours. Consequently I drive the IS250-C as a 2500cc, the current GS as a 2500 cc and a '98 GS300 for which there was never a 400 or 430 option here.
Lexus sold their cars to the UK with smaller engines - no doubt as our gas at the pumps is twice the price of yours. Consequently I drive the IS250-C as a 2500cc, the current GS as a 2500 cc and a '98 GS300 for which there was never a 400 or 430 option here.
01-29-18, 05:38 AM
#12
Not a C rather the 350 sedan. All but one road trip reflects 40% hwy / 60% city... I can't imagine the tune is much different or the results will be much different.
IS-350 MPG (17.4 gal max fill)
297.0 / 14.40 = 20.63
327.6 / 12.66 = 25.87
284.0 / 12.83 = 22.13
293.6 / 13.60 = 21.58
293.5 / 13.76 = 21.32
250.1 / 11.84 = 21.18
325.6 / 14.76 = 22.05
289.2 / 13.96 = 20.71
299.2 / 13.66 = 21.90
299.4 / 14.53 = 20.61
IS-350 MPG (17.4 gal max fill)
297.0 / 14.40 = 20.63
327.6 / 12.66 = 25.87
284.0 / 12.83 = 22.13
293.6 / 13.60 = 21.58
293.5 / 13.76 = 21.32
250.1 / 11.84 = 21.18
325.6 / 14.76 = 22.05
289.2 / 13.96 = 20.71
299.2 / 13.66 = 21.90
299.4 / 14.53 = 20.61
02-01-18, 12:24 AM
#13
I drive in California, so there's usually traffic highway or city. I average about 15-19 mpg driving in stop and go traffic in the morning and pretty loose traffic at night.
For the carbon buildup issue, that is something that many IS250's get due to the direct injection implemented in the engines. It shouldn't be a deciding factor, but it causes sluggish acceleration due to the carbon buildup in the engine. To remedy it, I believe some members use walnut blaster and it costs several hundred to fix. Carbon buildup can also be prevented by driving the car hard every now and then (I believe a Lexus document stated that xD), which means hitting redline from time to time. I had my IS250C for 90k miles and did not have the buildup issue.
I did recently, however, upgrade to the IS350C and from what I can see, the MPG difference is minor. The IS250C got around 17-19 mpg average for California traffic and the IS350C gets around the same, but has more power. Depending on whether or not you want the extra power, it might be worth considering, because the difference in acceleration and overall speed is day and night between the two. Again, the 350C is not for everybody, but the IS250C has speeds comparable to the HS250H. That means that the IS250C is slower than the NX200t, all RX models, most LX models and so forth, due to the additional ~400 lbs added for the hardtop convertible.
The IS350C has speeds comparable to the GS350 (duh same engine lol), the LS460 (V8) and is overall approximately 2.5-3 seconds faster than the IS250C in its 0 to 60 time. Again, if your dealer has both, I would take both for a test drive :]
Let me know if you have any questions and you can @ my username if you want to see an instagram of my car.
Best of luck in choosing the IS-C!
For the carbon buildup issue, that is something that many IS250's get due to the direct injection implemented in the engines. It shouldn't be a deciding factor, but it causes sluggish acceleration due to the carbon buildup in the engine. To remedy it, I believe some members use walnut blaster and it costs several hundred to fix. Carbon buildup can also be prevented by driving the car hard every now and then (I believe a Lexus document stated that xD), which means hitting redline from time to time. I had my IS250C for 90k miles and did not have the buildup issue.
I did recently, however, upgrade to the IS350C and from what I can see, the MPG difference is minor. The IS250C got around 17-19 mpg average for California traffic and the IS350C gets around the same, but has more power. Depending on whether or not you want the extra power, it might be worth considering, because the difference in acceleration and overall speed is day and night between the two. Again, the 350C is not for everybody, but the IS250C has speeds comparable to the HS250H. That means that the IS250C is slower than the NX200t, all RX models, most LX models and so forth, due to the additional ~400 lbs added for the hardtop convertible.
The IS350C has speeds comparable to the GS350 (duh same engine lol), the LS460 (V8) and is overall approximately 2.5-3 seconds faster than the IS250C in its 0 to 60 time. Again, if your dealer has both, I would take both for a test drive :]
Let me know if you have any questions and you can @ my username if you want to see an instagram of my car.
Best of luck in choosing the IS-C!
02-01-18, 01:28 AM
#14
I drive in California, so there's usually traffic highway or city. I average about 15-19 mpg driving in stop and go traffic in the morning and pretty loose traffic at night.
For the carbon buildup issue, that is something that many IS250's get due to the direct injection implemented in the engines. It shouldn't be a deciding factor, but it causes sluggish acceleration due to the carbon buildup in the engine. To remedy it, I believe some members use walnut blaster and it costs several hundred to fix. Carbon buildup can also be prevented by driving the car hard every now and then (I believe a Lexus document stated that xD), which means hitting redline from time to time. I had my IS250C for 90k miles and did not have the buildup issue.
I did recently, however, upgrade to the IS350C and from what I can see, the MPG difference is minor. The IS250C got around 17-19 mpg average for California traffic and the IS350C gets around the same, but has more power. Depending on whether or not you want the extra power, it might be worth considering, because the difference in acceleration and overall speed is day and night between the two. Again, the 350C is not for everybody, but the IS250C has speeds comparable to the HS250H. That means that the IS250C is slower than the NX200t, all RX models, most LX models and so forth, due to the additional ~400 lbs added for the hardtop convertible.
The IS350C has speeds comparable to the GS350 (duh same engine lol), the LS460 (V8) and is overall approximately 2.5-3 seconds faster than the IS250C in its 0 to 60 time. Again, if your dealer has both, I would take both for a test drive :]
Let me know if you have any questions and you can @ my username if you want to see an instagram of my car.
Best of luck in choosing the IS-C!
For the carbon buildup issue, that is something that many IS250's get due to the direct injection implemented in the engines. It shouldn't be a deciding factor, but it causes sluggish acceleration due to the carbon buildup in the engine. To remedy it, I believe some members use walnut blaster and it costs several hundred to fix. Carbon buildup can also be prevented by driving the car hard every now and then (I believe a Lexus document stated that xD), which means hitting redline from time to time. I had my IS250C for 90k miles and did not have the buildup issue.
I did recently, however, upgrade to the IS350C and from what I can see, the MPG difference is minor. The IS250C got around 17-19 mpg average for California traffic and the IS350C gets around the same, but has more power. Depending on whether or not you want the extra power, it might be worth considering, because the difference in acceleration and overall speed is day and night between the two. Again, the 350C is not for everybody, but the IS250C has speeds comparable to the HS250H. That means that the IS250C is slower than the NX200t, all RX models, most LX models and so forth, due to the additional ~400 lbs added for the hardtop convertible.
The IS350C has speeds comparable to the GS350 (duh same engine lol), the LS460 (V8) and is overall approximately 2.5-3 seconds faster than the IS250C in its 0 to 60 time. Again, if your dealer has both, I would take both for a test drive :]
Let me know if you have any questions and you can @ my username if you want to see an instagram of my car.
Best of luck in choosing the IS-C!
