Speed-Kar

As you drive your car uses fuel at a constant rate. When you run out of fuel your car coasts down to a much slower speed and avoiding the enemy cars becomes nearly impossible. Nearly... If the following enemy cars get too close you can spend a little bit of your fuel to emit a puff of smoke and hopefully buy yourself some time while they are confused. Each successive level features more enemy cars, different flags, different rocks, and different levels of speed, both for your car and the enemy cars. Every so often you will have a "CHALLENGE" stage, wherein the enemy cars will remain still until either you gather up all the bonus flags or else your fuel runs low. If you die during a Challenge stage you will be advanced to the next Regular stage immediately, if you have any remaining cars."