Here's some data from a chart a Cessna 152 manual(Lycoming 108BHP). It gives you an idea of how much power is lost as you go up in altitude. Granted, this data is for an airplane, but general aviation is probably the only place you'd find engine data like this. The engine isn't injected, but the table assumes the pilot is adjusting the mixture to ideal lean. Alt RPM %BHP GPH True Airspeed 2000' 2400 77 6.3 102 knots 4000' 2400 74 6.0 101 6000' 2400 70 5.8 101 8000' 2400 67 5.5 100 10000' 2400 63 5.3 99 12000' 2400 60 5.0 98 Notice how as you go up, power and fuel usage go down, but you can still maintain the same speed. -d At 09:27 PM 10/28/99 -0700, you wrote: >We live at about 4500', and when we drive to Tucson, at about 2500', we see >a BIG increase in power. Our gas mileage is always awful (12 to 13), but >the Van runs great. Nothing I've tried has helped. |
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