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Originally Posted by JamieGeek
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What kind of mileage do you get in your van?
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Jamie, as expected, it's also speed dependent, although not to the same extreme as in a motorhome. My 2-valve V10 is proportionally larger than required compared to an Axis, so when I slow down my engine becomes even less efficient (due to low load) which offsets part of what I could have gained.
At +/- 70 MPH I still get close to 15 MPG on the freeway, at 75 MPH it drops to around 14 MPG, and at 80 MPH (rarely do I drive that fast) I only got 13 MPG.
One time I drove at between 60 to 65 MPH to Texas Hill Country and back as a test and got 16 MPG, which was the highest I've ever measured. The van was newer then and didn't need a tune-up as at present.
One difference that helps me a little is that my van has 3.73 gears, which when adjusted for larger tires, would be closer to an Axis having 3.55 gears. But Axis probably came with 4.10 gears or more recently with 4.56 gears, which makes engine run at much higher RPMs. Not that higher RPMs is the main culprit to lower engine efficiency.
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