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Summer Gas Mileage Arizona
miagarfunckle
Member Posts: 51
I have lived in arizona for over 3 years and noticed when they put the summer gas in my mileage in all my cars drops drastically. Mileage drops from 3-4 mpg in all cars. Please let me know if you have experienced this and what your mileage is in the summer her in Arizona
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My guess is the biggest problems with his summertime fuel economy are the reformulated gas (they use that in AZ?) and his use of A/C, which a lot of folks forget to consider. An A/C compressor really sucks power.
The air loses density 1% per 333 feet AMSL and 1% per 11F these are additive vs 32F and SL......at 5,000 feet engine power is down 15%........in 110F engine power is only down 5% from SAE rated 60F.
However most/all ecu have a summer protective mode where the coolant temp is monitored and the AC ON signal is considered........ignition timing is reduced and fuel is enrichened [to cool cylinders] to protect the engine above 195F coolant sensor reading.......this has at most a 10% effect.......but may be additive to air temperature.
Each manufacturer is different as to how exactly they attack these problems.
Wow. So I guess in a very slight way a FI engine could actually use more fuel than a carbed engine in extreme heat? Of course, it's nice not having to listen to that carbed engine ping itself to death, huh?