Can this really happen? What the heck ...
#1
Can this really happen? What the heck ...
Ok, my car was getting awesome gas mileage, 21-22 mpg, in town driving, and after I changed the plugs, she's getting under 20 for sure. They're OEM platinum plugs, and I double checked the gap before installing. They were installed about a month ago. Can new plugs kill gas mileage? I've read awhile ago, some member didn't ever change his plugs because he was getting some awesome gas mileage as well, and why kill a good thing. After the new plugs, I noticed her starting up way better and she drives a tad different. But it wasn't till at the pumps, I noticed her being a hog. Any suggestions?
#3
colder weather+ new plugs= has nothing to do with poor gas mileage, what grade gas are you using? 89 91 or 93? fill your tires up with air when it got cold? that could be one reason why.
#4
Originally Posted by doc2278
colder weather+ new plugs= has nothing to do with poor gas mileage, what grade gas are you using? 89 91 or 93? fill your tires up with air when it got cold? that could be one reason why.
#5
make sure your tires are not over inflated. also, it sounds like you are talking about ` to 2 mph? that could be a difference in how you drive, the type of 91 gas you use, etc... you may want to throw some fuel injector cleaner in there....
#8
Originally Posted by doc2278
colder weather+ new plugs= has nothing to do with poor gas mileage, what grade gas are you using? 89 91 or 93? fill your tires up with air when it got cold? that could be one reason why.
In some states they switch to a winter blend of gas which causes poor milege. If your stations just switched that could explain it.
#9
Colder weather = longer open loop operation/lower tire pressures (if unchecked); thus lower mileage. Add short trips and you have a huge decrease in mileage. The plug change is just coincidence.
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