If you are going to go less than 55, you'll prob have roughly the same fuel consumption..(you'll just be going a shorter distance on that gallon, getting you worse mileage) This is all just theoretical talk, I dont know where that exact speed is.....its most likely your slowest speed in your top gear.........
Without getting too terribly in depth with theoretical engineering, the answer to your question is yes. The Ideal Gas Law (PV=nRT) is pretty much the basis for the algorithms in the ECU. In effect, this law allows us to determine the amount of usable air in the cylinder for a given pressure and temperature (values for which our sensors measure). Since the volume is a constant, only the air density will change via differences of temperature and pressure. RPM is simply a change in time. The AFR will change on the fly many times a second for changes in any number of inputs.
One of these inputs is engine load. Engine load is directly related to your go-fast foot. Ease the aggressive nature of your go-fast foot and the engine will not experience high loads and therefore will not need high levels of fuel injection. Load is also directly related to wind resistance (though it is commonly and erroneously referenced to speed). The higher the resistance, the more power and thus fuel needed to overcome this resistance.
In sum, driving 85 will consume more fuel than driving 75 which will consume more fuel than 65 and so on down the line. However, driving 75 in fifth gear will probably get you better gas mileage than driving 55 in fourth or 35 in third. Speed is only a factor when comparing in the overdrive.
Clear as mud?
One of these inputs is engine load. Engine load is directly related to your go-fast foot. Ease the aggressive nature of your go-fast foot and the engine will not experience high loads and therefore will not need high levels of fuel injection. Load is also directly related to wind resistance (though it is commonly and erroneously referenced to speed). The higher the resistance, the more power and thus fuel needed to overcome this resistance.
In sum, driving 85 will consume more fuel than driving 75 which will consume more fuel than 65 and so on down the line. However, driving 75 in fifth gear will probably get you better gas mileage than driving 55 in fourth or 35 in third. Speed is only a factor when comparing in the overdrive.
Clear as mud?
On a 600+ mile trip I figured out that I averaged 23-25mpg. Thats with highway driving, highway traffic driving and driving through cities like NY. At 100mph in 6th gear with my 3.73s the engine spins at around 1800rpms. Getting better mpg's were not my priority. I cruised at around 75mph and that was with traffic and all of my crap from college. I was young and had more balls than brains at that time. In one section I drove at 150+mph for over 5 minutes, and when I was in Ct I got pulled over doing an honest 120mph, spoke nothing but the truth to the cop in a undercover crown vic and got off with a verbal.
Before I blew up my t5 with 2.73's, things felt really similar to my current t56 with 3.73's.
I should also note that I do not have a rear wing.
Fawcett
Before I blew up my t5 with 2.73's, things felt really similar to my current t56 with 3.73's.
I should also note that I do not have a rear wing.
Fawcett