Over a hundred thousand miles of 87 octane in an engine with a compression of well over 9:1 I'd bet the cylinder walls are scored to hell from pre-detonation so the seal would be terrible. Would account for a fairly significant drop in fuel economy but IMO would do so over time and not all at once.


ALSO this truck came with standard copper plugs RATED FOR 30,000 miles. I've seen 'em still in decent shape at 50k miles but 116k???

 

I know there was a drastic warm up(45*F.lol) for a couple of days. It melted a lot of snow. This means a lot of water run off. Where does that water go when the ground is frozen? It gets mixed in with the gasoline that is in the tanks under ground.
Not to mention the moisture that happens naturally from weather changes.

I only use High volume gas stations. I avoid the small stations, ones that get little traffic and the old stations that are using old school pumps(tanks have got to be leaking and/or rusting)
I've never had gas problems because I'm selective.

Where do you live?

 

I'm in mass

 

Putting some "dry gas" in the tank to get rid of all that water wont hurt... worth a shot.

 

I didn't even know I had remote start until I accidentally activated it this winter.

I use it all the time since it's been so cold.

My daily commute is relatively short (10-15 minute local drive) and I'm usually warming up the car with remote start for at least 5 minutes.

I noticed that I've lost 4 mpg.