Search:

You need to get one of those inspections scopes so you can get a look inside without tearing anything apart, and look inside the heater core. Where is the electric heater, any chance it's set up...

You seem to rack up miles almost as fast as me, I have 206,000 on a 09 cobalt xfe, I drive easy, minimize brakes etc. trying to get good FE, still original brakes. $3-400 worth of parts, in that...

You can change your own oil and maintain the warranty, but you have to document and save the receipts.

https://www.consumer.ftc.gov/articles/0138-auto-warranties-routine-maintenance

My regular station, E0 is $2.40 (91 octane) E10 $1.90 (87), E15 $1.80(88), & E85 $1.65. When I could get 87 E0 I lost 2-3% fuel economy using E10, price difference used to be 10%. The FE...

Cars don't care what the AFR is, they are really is just trying to maintain stoich. It uses LTFT even in open loop to adjust for fuel variations. Put in some E30 (30% ethanol) or 2 gallons of E85...