From page 1, if your speedo was “off” before it was overestimating your mpg before you swapped wheels/tires. Better than reality. If it reads correct now then it is likely your mpgs are actually correct. Other factors, section width, weight, rolling resistance, tread design. Lots of factors here. Temperatures and winter/summer fuel. All factors.
I have had my 17’ in 3 days of -25 degrees with very stiff steering among other odd electrical behavior and loud engine startup noises. It sounds like your system is overly sensitive to cold. I would love to find a remedy to make this electrical steering feel normal in the cold. Our temps rarely go above 32 from December to April. My 15’ hemi charger uses an electric motor to power a hydraulic pump for it’s “electric power steering.” I’ve had that car in -40 without an issue and the steering effort never changes.
I have duratracs now. Great traction in all conditions so far. Way overpriced though. I’ve had multiple sets of General Grabber AT2’s over the years. Great all around tire. I wishe they made them in a 255/60-20 or similar to fit my truck. Im thinking about going down to an 18” wheel to get those tires again.
Impressive yes but 500,000 continous highway miles are different than say 200 or 300k over 10-15 years. Cold starts, hot starts, 3-4 starts per day, etc. I might switch to that “annual” oil on my wife’s durango. We barely get to 5k miles in 12 months on her car. Ive put 14k miles on my Sierra in 15 months.
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