gas mileage
10-09-09, 05:53 PM
#16
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But anyway back on topic ming15237 is right on the money. I can drive the exact same way and get different mileage depending on which brand of gas I use. I seem to get worse mileage with cheaper gas like from sams and discount gas places. The best I have gotten in the ISF is 28mpg doing 65-70 on the interstate using the cruise control. I have never tried the snow setting but that sounds like it should work by keeping the car from downshifting when you need to pass or accelerate.
10-09-09, 06:40 PM
#17
10-09-09, 08:05 PM
#18
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I didn't necessarily buy this car for mileage, but for being a 5.0L V8 and thirsty for fuel, I average 23-25mpg on mixed city/hwy driving. I have no complaints. I have nearly 22k miles on my 09 IS F and mileage is very consistent.
10-10-09, 08:30 AM
#20
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several things have a great deal on influence on fuel mileage. First is the driver and their acceleration style. So on the highway this will be reduced greatly with the use of cruise control. I often pit my car in "snow" mode on the highway, this keeps the car from downshifting all the time, a higher gear=better fuel economy...
10-10-09, 11:08 AM
#22
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several things have a great deal on influence on fuel mileage. First is the driver and their acceleration style. So on the highway this will be reduced greatly with the use of cruise control. I often pit my car in "snow" mode on the highway, this keeps the car from downshifting all the time, a higher gear=better fuel economy, and in my view takes a lot of the nervousness out of the vehicle (i.e. I do NOT want to change lanes if I sneeze!) oil type/weight used has an effect on fuel mileage (synthetic does as well to a much lesser degree)(thats why the car manufactures put that little number on the oil fill cap folks 5w30) fuel type used, my vehicle on the highway on one very long trip down the east coast got 22 mpg on the highway with Exxon fuel, 27 mpg with Shell, and 31 mpg with BP. I did not change any other variables other than fuel brand. i simply relaxed, sat back at 70mph and let the computer do the work. my car only has 4500 miles on it by the way.
10-10-09, 11:40 AM
#23
yup! thats me as well. if i wanted a fuel efficient car, i wouldve gone with the camry or even a prius, but i wanted something that isnt so common on the roads today. the smile one your face and mine....that is truly priceless, no matter how much gas is these days!
10-10-09, 12:51 PM
#24
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10-10-09, 12:59 PM
#25
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several things have a great deal on influence on fuel mileage.
...
my vehicle on the highway on one very long trip down the east coast got 22 mpg on the highway with Exxon fuel, 27 mpg with Shell, and 31 mpg with BP. I did not change any other variables other than fuel brand. i simply relaxed, sat back at 70mph and let the computer do the work. my car only has 4500 miles on it by the way.
...
my vehicle on the highway on one very long trip down the east coast got 22 mpg on the highway with Exxon fuel, 27 mpg with Shell, and 31 mpg with BP. I did not change any other variables other than fuel brand. i simply relaxed, sat back at 70mph and let the computer do the work. my car only has 4500 miles on it by the way.
10-11-09, 05:41 AM
#26
Have to disagree on this one, sorry... But this all took place in the same similar temps and elevation, as a matter of fact Va has lower sea level than Pa does, therefore I should have gotten better fuel mileage due to the more oxygen rich air. winds were a moot point as well calm sunny days in Va and Nc, Sc, and Ga. In the automotive industry there are known differences between grades of fuel. This is why "most" auto manufacturers suggest using ONLY "Top Tier Fuels". BP is NOT rated as a "Top Tier Fuel" however it is what gets me the best fuel economy. Temps do have an effect on mileage but all were fairly similar at the time, and humidity level was similar as well.
10-11-09, 10:27 PM
#27
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Still too many variables you can't control. It's hard enough to compare results on a closed course, but when you start talking about "on a trip down the East Coast" you've thrown all objectivity out the window because there are far too many variables you can't control.
You realize you're claiming a 50% difference in mileage based on fuel brand? If this were true, BP would own the market, lock, stock, and barrel.
I don't disbelieve you saw this result, but you also fail to account for so many things - wind, net elevation changes, traffic, time on cold cycle, etc, that it's not possible to do anything but say I got these results over this trip. For example, here is a spreadsheet with my trip from California to Atlanta. Every mile was driven on Shell gasoline. Note the mileage differences - they're pretty significant.
Beyond this, the gasoline manufacturers all use the same base stock, and the only real difference is the additive packages. BP are notorious for using the least amount of additives, so over the long run you'll see more carbon build up and injector spray pattern degradation with BP. Finally, additive packages between gasoline manufacturers are often antagonistic. So very often when switching from one brand to another, you will remove deposits from one brand and start building up new deposits based on the new additive package. During the transition, you'll see improved mileage.
To completely ice the cake, acetone in very low concentrations has been touted as a fuel mileage extender however my own experiments showed an initial increase that disappeared after 3 tanks of fuel. More than likely the acetone was antagonistic to build up I had from my brand of fuel, and once the build up was gone, so was the improved gas mileage.
You realize you're claiming a 50% difference in mileage based on fuel brand? If this were true, BP would own the market, lock, stock, and barrel.
I don't disbelieve you saw this result, but you also fail to account for so many things - wind, net elevation changes, traffic, time on cold cycle, etc, that it's not possible to do anything but say I got these results over this trip. For example, here is a spreadsheet with my trip from California to Atlanta. Every mile was driven on Shell gasoline. Note the mileage differences - they're pretty significant.
Beyond this, the gasoline manufacturers all use the same base stock, and the only real difference is the additive packages. BP are notorious for using the least amount of additives, so over the long run you'll see more carbon build up and injector spray pattern degradation with BP. Finally, additive packages between gasoline manufacturers are often antagonistic. So very often when switching from one brand to another, you will remove deposits from one brand and start building up new deposits based on the new additive package. During the transition, you'll see improved mileage.
To completely ice the cake, acetone in very low concentrations has been touted as a fuel mileage extender however my own experiments showed an initial increase that disappeared after 3 tanks of fuel. More than likely the acetone was antagonistic to build up I had from my brand of fuel, and once the build up was gone, so was the improved gas mileage.
10-12-09, 10:59 AM
#28
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lobuxracer:
Nice spreed sheet and a good bit of info there. Cant argue with real world numbers. You only had a difference of about 5-6 mpg through out the trip. Have you ever considered there might be a difference in gas with the same brands from different parts of the country? I am sure west coast gas has different additives-formulations from the south and especially north east gas. And of course gas differs depending on the time of the year. Just a thought
Nice spreed sheet and a good bit of info there. Cant argue with real world numbers. You only had a difference of about 5-6 mpg through out the trip. Have you ever considered there might be a difference in gas with the same brands from different parts of the country? I am sure west coast gas has different additives-formulations from the south and especially north east gas. And of course gas differs depending on the time of the year. Just a thought
10-12-09, 12:43 PM
#29
Still too many variables you can't control. It's hard enough to compare results on a closed course, but when you start talking about "on a trip down the East Coast" you've thrown all objectivity out the window because there are far too many variables you can't control.
You realize you're claiming a 50% difference in mileage based on fuel brand? If this were true, BP would own the market, lock, stock, and barrel.
I don't disbelieve you saw this result, but you also fail to account for so many things - wind, net elevation changes, traffic, time on cold cycle, etc, that it's not possible to do anything but say I got these results over this trip. For example, here is a spreadsheet with my trip from California to Atlanta. Every mile was driven on Shell gasoline. Note the mileage differences - they're pretty significant.
Beyond this, the gasoline manufacturers all use the same base stock, and the only real difference is the additive packages. BP are notorious for using the least amount of additives, so over the long run you'll see more carbon build up and injector spray pattern degradation with BP. Finally, additive packages between gasoline manufacturers are often antagonistic. So very often when switching from one brand to another, you will remove deposits from one brand and start building up new deposits based on the new additive package. During the transition, you'll see improved mileage.
To completely ice the cake, acetone in very low concentrations has been touted as a fuel mileage extender however my own experiments showed an initial increase that disappeared after 3 tanks of fuel. More than likely the acetone was antagonistic to build up I had from my brand of fuel, and once the build up was gone, so was the improved gas mileage.
You realize you're claiming a 50% difference in mileage based on fuel brand? If this were true, BP would own the market, lock, stock, and barrel.
I don't disbelieve you saw this result, but you also fail to account for so many things - wind, net elevation changes, traffic, time on cold cycle, etc, that it's not possible to do anything but say I got these results over this trip. For example, here is a spreadsheet with my trip from California to Atlanta. Every mile was driven on Shell gasoline. Note the mileage differences - they're pretty significant.
Beyond this, the gasoline manufacturers all use the same base stock, and the only real difference is the additive packages. BP are notorious for using the least amount of additives, so over the long run you'll see more carbon build up and injector spray pattern degradation with BP. Finally, additive packages between gasoline manufacturers are often antagonistic. So very often when switching from one brand to another, you will remove deposits from one brand and start building up new deposits based on the new additive package. During the transition, you'll see improved mileage.
To completely ice the cake, acetone in very low concentrations has been touted as a fuel mileage extender however my own experiments showed an initial increase that disappeared after 3 tanks of fuel. More than likely the acetone was antagonistic to build up I had from my brand of fuel, and once the build up was gone, so was the improved gas mileage.
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