Originally Posted by CoreyMS
Could be a plug quality issue, rather than a heat range issue. I've swapped back and forth a few times as well. I get similar mileage and performance. I'm thinking about testing a set of stock heat range better quality plugs next.
Watt, both gapped the same? Gap can change idle quality ect....
Hey, curious --- what is your mpg? My sucks at 17 average on highway I travelled 20 times. It used to be 19.8 mpg and best 20.1. I'm not seeing any fuel milage improvement with recent MPT tune 87 economy with chilled.
Maybe I should ask Mike from MPT...but wanted you to answer what kinds of mileage your experiencing. It seems the cold weather is almost over, been getting low 15s to 17.8 tops. Need a real solution here!