Frankie_B Posted August 5, 2006 Share Posted August 5, 2006 Trying to find the most efficient way to drive the car on long distances, I started thinking about the "optimum" highways speed. Of course I could drive at 2000 rpm and keep it just around 55 mph, have excellent gas milage but then fall asleep behind the wheel because I'd be barely moving. But driving at over 85 mph and 3000 rpm seems to be getting hard on the gas milage What do you find is the best combination of speed and gas milage for the ES, provided it has to be over 60 mph? Anybody has a graph of fuel flow vs. rpm - that'd be an excellent aid! Quote Link to comment Share on other sites More sharing options...
camlex Posted August 5, 2006 Share Posted August 5, 2006 Hello, 75 MPH I am getting 28 MPG. changing air filter and PCV every 15,000. with 204500 still using 5W30 Castrol synth. Blend and changing oil every 4000 miles. Hope that helps. Quote Link to comment Share on other sites More sharing options...
Toysrme Posted August 5, 2006 Share Posted August 5, 2006 72-75-80. Only yankees drive 55-60mph on the highway. Time is money. Anybody has a graph of fuel flow vs. rpm - that'd be an excellent aid! Buy a multi meter & fuel pressure gauge. Take injector duration x fuel pressure. From there you can exactly calculate the amount of fuel you're presently using. A 241cc @ 41psi injector that is running 20% duration @ 33psi is using: (216.41cc @ 33psi * 20%) 43.282cc of fuel / min *6 (6 fuel injectors) = 259.692cc / min of fuel. Or if you wanna be all SAE about it... 24.732 lb/m of fuel. It's an 18.5 gallon tank (70.03 L). You could drive for 269.66 minuets before you ran out of gas at 20% duration. Or... A hair under 4 1/2 hours. I digress, it's not about rpm, it's about injector duration VS fuel pressure. That constitutes how much fuel is currently being used. While RPM has an aspect to play because of the fueling tables, it has just as much to do with the condition of the engine, mods, performance, load. etc. What constitutes fuel uses is percieved engine load from the computer. :) Quote Link to comment Share on other sites More sharing options...
amf1932 Posted August 6, 2006 Share Posted August 6, 2006 What do you find is the best combination of speed and gas milage for the ES, provided it has to be over 60 mph? 61 mph! Your gas mileage will continually go down as your speed increases, because of wind resistance. ;) Quote Link to comment Share on other sites More sharing options...
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