toddmakesamove
Member
@Dannycameo The reason why your truck is getting less mpg despite altering the load on your truck is because; cold air is more dense than warm and requires more fuel. You will make hp and tq more readily or increase by tune when intake temps are cooler. It has nothing to do with anything else.
Extreme example: I live in GA. We can have an 80-degree day with a - 40-degree night. If I was driving a highly tuned car with a turbo, I would have to run different maps, to starve off knock/detonation. Air is thin during the day and cold and dense at night. Those changes are so vast to a highly tuned car the computer cannot make up the difference with computer adjustments alone. Air intake could be +150-degrees during the day and 40-degrees at night. I would run maps that dumped fuel and added timing during the cold in comparison to summer maps.
The example for most, with summer and winter driving, are normal vehicles will adjust the fuel, but it happens over months, and most don't really notice it. IME, the difference is 2-5 mpg (vehicle dependent) between summer and winter. While normal vehicles won't add timing, they do have to account for the colder denser air of the winter, to not have detonation/knock.
Extreme example: I live in GA. We can have an 80-degree day with a - 40-degree night. If I was driving a highly tuned car with a turbo, I would have to run different maps, to starve off knock/detonation. Air is thin during the day and cold and dense at night. Those changes are so vast to a highly tuned car the computer cannot make up the difference with computer adjustments alone. Air intake could be +150-degrees during the day and 40-degrees at night. I would run maps that dumped fuel and added timing during the cold in comparison to summer maps.
The example for most, with summer and winter driving, are normal vehicles will adjust the fuel, but it happens over months, and most don't really notice it. IME, the difference is 2-5 mpg (vehicle dependent) between summer and winter. While normal vehicles won't add timing, they do have to account for the colder denser air of the winter, to not have detonation/knock.