Although the Cruze used in this article is an ECO MT, the chart showing MPG vs. MPH works for all cars. Basically, the slower you can go while staying in 6th gear the better your MPG. Prior to seeing this article I had tested my ECO MT for fuel economy on various streets and roads with 45, 50, 55, 65, and 75 MPH speed limits. I hit the MPG numbers in the Motor Trend chart for the ECO MT. Measurements were with my DIC but I adjusted the numbers I got down by 5% as that seems to be the optimism for my car's DIC.40 MPG Comparison Constant Speed Chart Photo 13 that I posted at http://www.cruzetalk.com/forum/27-f...-mpg-compact-sedan-comparison.html#post102658 might interest the OP.
Try it with cruze control on the same route and similar weather conditions. You'll get a couple more MPG. The ECU is far better than the foot on flat driving at maintaining speed while keeping average RPMs down. Also boost your tire pressure to at least 45 PSI (40 for the non-ECOs) if you can handle the slightly noisier ride and stiffer road feel. Don't go over the sidewall pressure, however. With these changes I get 42 MPG at 75-77 MPH. At 70 I get slightly over 45 MPG.so i been doing some long trips the last few week from pittsburg to cleveland its about 150m one way and w/o cruise control i was getting 43mpg @ 70mph
...exactly:Conventional wisdom tells me it'll come at 42 mph which is right when the car slips into 6th gear and the engine is moving at about 1500 rpm.
...the "hypermiler" driving mantra, "...in highest gear, at slowest speed, that doesn't lug the engine..." contains three distinct constraint regimes:
1) "...in highest gear," -- where engine loading & efficiency are highest.
2) "...at slowest speed," -- engine RPM affects loading & efficiency; this is transmission & axle ratios, and road speed!
3) "...that doesn't lug the engine." -- the "bottom" of the bathtub-curve; this is engine torque, and where higher fuel octane helps.
Same. The Eco MT is a whole different animal than the auto Cruzes. Going 60-65mph with steady traffic (not being the only one on the road), I regularly average ~55mpg according to the DIC.Driving a 106 mile round trip. Cruise @ 72. I got 43.2.
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Actually with most hills what you loose in MPG you will gain on the downhill side coasting(thanks to DFCO), a few exceptions, extreme grades, hills larger than 300ft elevation change, & super long grades that keep the car under heavy load for miles. In those conditions I have to have a very easy route for at least 3-5miles after the hill to gain back all I have lost according to the DIC.Depends on many factors, terrain being the most critical.