Hello folks,
my 2k has had a recent increase in mpg that I am trying to understand. If it is something I did, I want to keep doing it so I was wondering if anyone else experienced this.

When I first got the car I was barely getting 260 per tank. now I am getting about 315-325. The change came after I changed the oil last. I also added a K&N filter element when I first got it on October. My question is: Does the ECU recalibrate after a while (since I changed the filter) or should I be looking elsewhere?

 

When I had an oil and filter change, my mpg went up too. Not as much as yours, but close. I switched from whatever the dealership was using to Mobil 1 Supersyn 5w30, and I was using a brand new OEM filter. Maybe your mpg went up more than mine because you used a less restrictive filter than I did.

I think both of us saw gains in gas mileage just because we pulled regular maintenance. If your car can't breathe freely, fuel economy and power will suffer.

 

Did you switch gas brands? Mine went up 30 miles after switching from BP to Shell

 

what kind of ocate you use in your car

 

octane......sorry

 

I've been using Quiktrip and BP gas, because the Texaco/Shell gas around here makes my car smell funny, like eggs.

 

I also put a K&N filter into my car, and I noticed that my MPG went up too. I also noticed a slight increase after I put a turbonator into my car. However, after I took the turbonator out, I noticed that my exhaust does smell funny. Does the ECU recalibrate?

 

if your car is new, it's because your engine is becoming more broken in. Mileage will increase as the engine breaks in. Of course it'll only increase in mileage up to a certain point. Using Synthetic oil will increase it a bit too.

 

ninety three 93

 

My Maxima has only seen 92 once and all the rest its been 93 or 94.
There's a Sunoco in lancaster on the manheim pike that has 94 Octane as their
premium grade. (FYI For you central Pa guys.) I try and fill up there whenever I get down there.

 

I did put Mobil1 in there (5W30). We may be on to something...

 

It says he has a 2000. unless he bought the car, and locked it up for 5 years, I hardly doubt that the car is new, and going through a break in stage...

 

by any chance, did you do alot more driving on the highway than the city?

 

I guess we're both assuming. I assumed that when he said when he first got the car he was getting 260/fillup and now more... well, obviously the engine is broken in. All I know is when the dealer mistakenly did an oil change on my car while it was in for warrenty coil replacement, my car which has seen only synthetic oil since the 1st oil change back in 10/2000, it now only gets 22-23 mpg when I was getting 26-27 average with synthetic. They owe me a synthetic oil change which I'm going in this weekend for. Cold weather, highway use, "lead foot" all have to do with mileage, oh yea, whether you leave the AC/ front defrost on all the time or not and tire pressure too. I don't think oil filters will increase mileage. It might filter better so the oil stays cleaner longer. But then, synthetic oils keeps engines cleaner anyways.

 

I am actually comparing 2 trips to MA, which is how I noticed.