I am new to 1/8th and I have something that I have been wondering about and would like to know what you guys think about the subject.

My first and only race with the car on the first qualifier the car was stock with mid to large size tires ( not sure the exact size) and I just made time, came across the line and ran out of fuel.

After that run I put a one tooth smaller spur on second gear because I thought that the car was topping out early on the straight. The car ran out of fuel even earlier. I also put a little more wing in the car so I think that I was getting in the throttle a little bit harder and earlier then in the first qualifier.

For the third round I thought that the tires where getting small so I put the stock spur back on and put a one tooth larger pinion on second and it ran out of fuel even sooner then the other two rounds. I don't know what the over all roll-out was to really be sure.

Is it possible that the engine is more efficient geared higher like in the first round? I do know that I had a faster qualifing time each round untill I would run out of fuel on the last two rounds.