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I would like to know for the 4cy 5 speed guys,at hiway speed,say 55-60....what rpm are you turning and post tire size also. Mine seems kinda high at 60 mph.


With 31's around 3000-3200rpm. Remember these trucks have 4.62 axle gears, and it's on purpose. My best mileage ever in my Raider was 19mpg at 55mph in 4th gear for about 2 hours, fully loaded with all my belongings. Also the KM145 has a weak 5th gear, so I stay out of it most of the time for the sake of transmission life. Plus with 31's who needs overdrive. Its only useful around 70mph, which I only rarely do.

Also keep in mind that 3000rpm is loafing for most 4cyl motors ;-)

1987 Raider, 346K miles and going strong -31" tires, otherwise stock.
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