15% reduction in MPG after 1st oil change
#1
15% reduction in MPG after 1st oil change
I just had my oil changed. Cost was $45+ tax. (They wanted $40 for Tire Rotation, but I passed on this).
I was working on 47mpg tank, but at oil change, my trip meter was reset (by product of clearing service wrench?).
The second half of the tank after oil change, I averaged 41mpg over ~200miles. The drop in mileage doesn't compute with me - Maybe breaking in new oil causes mileage drop...
Anyway, I am on a new tank and am back to 46mpg. Maybe it was just an anomoly.
Did anyone else experience something like this?
I was working on 47mpg tank, but at oil change, my trip meter was reset (by product of clearing service wrench?).
The second half of the tank after oil change, I averaged 41mpg over ~200miles. The drop in mileage doesn't compute with me - Maybe breaking in new oil causes mileage drop...
Anyway, I am on a new tank and am back to 46mpg. Maybe it was just an anomoly.
Did anyone else experience something like this?
#2
Re: 15% reduction in MPG after 1st oil change
Nope. Didn't happen to me, and I've never heard that. Maybe you were driving a bit differently, or in slightly different conditions? Could anything else have changed? If anything, it's counterintuitive that the mileage would drop after an oil change.
#4
Re: 15% reduction in MPG after 1st oil change
I thought it was strange, too. Same driving pattern - if anything I spent more time on Freeway.
I even checked tire pressure to see if the mechanic had lower it to spec, but that wasn't the case.
Anyway, back to normal.
I even checked tire pressure to see if the mechanic had lower it to spec, but that wasn't the case.
Anyway, back to normal.
#6
Re: 15% reduction in MPG after 1st oil change
Actually, I also noticed a slight drop for the first tank following the oil change. And I did the change myself so I know it was done right.
Like you, after a few hundred miles it was back to normal. Several tanks since and I now have an improvement in mileage. But that's because I'm still learning how to drive this dang thing. It's more fickle than my wife.
Ron in SoCal
Like you, after a few hundred miles it was back to normal. Several tanks since and I now have an improvement in mileage. But that's because I'm still learning how to drive this dang thing. It's more fickle than my wife.
Ron in SoCal
#7
Re: 15% reduction in MPG after 1st oil change
I got it done at Honda dealer in Silicon Valley (Can I name the dealership?)
After 300 miles, my mileage is better than average (48mpg - 50miles into tank).
Maybe, draining oil and refilling leave some spots that doesn't get lubricated for awhile?
Here is my observation:
6 miles - 8400 miles -- 44-45mpg
~8200 - 8400 miles -- 46mpg
~8400-8650 miles -- 41mpg
8650 - 8700 miles -- 48mpg..
Interesting....
BTW, I will be making a road trip to Long Beach, CA from San Jose next week.
I'll report afterwards.
John
After 300 miles, my mileage is better than average (48mpg - 50miles into tank).
Maybe, draining oil and refilling leave some spots that doesn't get lubricated for awhile?
Here is my observation:
6 miles - 8400 miles -- 44-45mpg
~8200 - 8400 miles -- 46mpg
~8400-8650 miles -- 41mpg
8650 - 8700 miles -- 48mpg..
Interesting....
BTW, I will be making a road trip to Long Beach, CA from San Jose next week.
I'll report afterwards.
John
#9
Re: 15% reduction in MPG after 1st oil change
Originally Posted by Casper49
I just had my oil changed. Cost was $45+ tax. (They wanted $40 for Tire Rotation, but I passed on this).
I was working on 47mpg tank, but at oil change, my trip meter was reset (by product of clearing service wrench?).
The second half of the tank after oil change, I averaged 41mpg over ~200miles. The drop in mileage doesn't compute with me - Maybe breaking in new oil causes mileage drop...
Anyway, I am on a new tank and am back to 46mpg. Maybe it was just an anomoly.
Did anyone else experience something like this?
I was working on 47mpg tank, but at oil change, my trip meter was reset (by product of clearing service wrench?).
The second half of the tank after oil change, I averaged 41mpg over ~200miles. The drop in mileage doesn't compute with me - Maybe breaking in new oil causes mileage drop...
Anyway, I am on a new tank and am back to 46mpg. Maybe it was just an anomoly.
Did anyone else experience something like this?
I did read in the manual that the AC will make a dramatic difference in mileage, but have been running the AC all along here in Texas since March, when summer arrives. Guess window tinting comes next.
Bob