GearNut, 420cc Predator motors are designed to run for 3 hours on a gallon of fuel @ 1/2 load
at half load the machine is cruisin around 37-38 mph. Now I ran 55-60mph on the return trip and got 65mpg.
Fuel economy was tested using a cruise control (MC style) and a gallon of (93 oct.) fuel on SR 19 Southbound & US 30 Eastbound (very few stops and flat) 114.7 miles under ideal conditions.
I'm curious to see what it'll get in town under stop and go conditions.
Getting better gas milage out of vehichles is kind of an obsession for me
My 1972 1 ton 4x4 ford truck with the 300 6cyl. gets 27+mpg in town
My Dads 2008 chevy caviler gets 48mpg in town and 59mpg highway
Heck a brand new vehichle can get 15-20% better fuel economy simply by correcting the factory air/fuel mixture settings. Then match the intake and exhaust ports to their counterparts so everything flows smoothly.
You can also increase the volume of your fuel. I'll explain what I mean by this: If you raise the temp of gasoline to 220 degrees in a oxygen free enviroment ( fuel just like water will expand), a gallon of fuel will become 1.09 gallons by volume this alone will increase fuel milage by 9%. This can be done with materials found at any hardware supply. The trick for me was to keep it that temp till it was in the intake. All lines must fuel lines need to be steel. I preheat the fuel in the long line under the car using heat tape wrapped around the line tightly plugged into a small power inverter thats plugged into a 12v power supply outlet in the trunk. Under the hood I have piece of copper pipe the same outer diameter as the inner diameter of the radiator hose coming out of the water pump. Inside this pipe is tightly coiled copper tubing that attaches to the fuel line using compression fittings. it is then ran back to the engine and wrapped tightly around the exhaust then back to the throttle body where it enters the engine @ 220+ degrees. Proof that it works my dads chevy gets better milage then a new prius