We're having trouble getting 5 minutes out of a tank. I that the fuel we use is the culprit; but it makes our engines run cooler, and have the maximum nitro content allowed in Australia. We don't want to change fuel, so we are looking for way to stop us running out of fuel on the last lap without re-fueling. Do exhaust coolers really work to improve fuel economy?

I'm not the smartest cookie around, and I have trouble understanding how it could. The pressure at each end of a hose will be equal at both ends to my way of thinking; regardless of its length, or devices between either end (other than diaphragm valves).

Could someone enlighten me about this, or has anyone had experiences where exhaust coolers have definitely helped?

Kindest regards,
Lars,