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Myself · 10-23-2009, 03:42 PM

An aftermarket multiple spark type ignition is usually good for a couple mpg. Also I have found the higher dollar spark plugs help too. I'm talking 5$ and up a piece. In my last 5 engine builds, all have received performance street cams and aluminum intakes, and all have done better than stock in the mpg dept. The engine doesn't have to work as hard to pull that heavy mass around. Also, I'm still waiting for my neighbor to put some mileage on it, but I recently installed a hydrogen gas system on his '97 Lexus SUV. He had been getting 13/14 mpg every day in town. I'll make a post about the outcome when he brings me some numbers in 1000 miles or so. We're hoping for around 19mpg.

10-23-2009, 03:42 PM	#22
Myself Registered User Join Date: Oct 2005 Location: Northern Arkansas Posts: 1,173	Re: Fuel milage An aftermarket multiple spark type ignition is usually good for a couple mpg. Also I have found the higher dollar spark plugs help too. I'm talking 5$ and up a piece. In my last 5 engine builds, all have received performance street cams and aluminum intakes, and all have done better than stock in the mpg dept. The engine doesn't have to work as hard to pull that heavy mass around. Also, I'm still waiting for my neighbor to put some mileage on it, but I recently installed a hydrogen gas system on his '97 Lexus SUV. He had been getting 13/14 mpg every day in town. I'll make a post about the outcome when he brings me some numbers in 1000 miles or so. We're hoping for around 19mpg.