The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**Jason Banks** · 05-23-2023, 07:28 PM

I kind of agree with you on temp. My straight 6 truck has a 4 core radiator and can idle in a 4th of July parade for hours. My LS swap, I'm getting up to closer to 212+ when the high speed fans kick on. I'm pretty sure your mechanic is right about it being more efficient/clean burning at higher temperatures.

I think you can mathematically what kind of increase in MPG you would get out of the lower gears, but you are still driving a brick into the wind, I'd imagine the improvement is minimal, since you already have overdrive, the RPM's at speed are not that high anyway...

05-23-2023, 07:28 PM	#2
Jason Banks Senior Member Join Date: Dec 1999 Location: TX Posts: 1,528	Re: a/c charged and cooling I kind of agree with you on temp. My straight 6 truck has a 4 core radiator and can idle in a 4th of July parade for hours. My LS swap, I'm getting up to closer to 212+ when the high speed fans kick on. I'm pretty sure your mechanic is right about it being more efficient/clean burning at higher temperatures. I think you can mathematically what kind of increase in MPG you would get out of the lower gears, but you are still driving a brick into the wind, I'd imagine the improvement is minimal, since you already have overdrive, the RPM's at speed are not that high anyway...