diff -r 173d0863a804 -r 0b38de31ad5d blackbox/main.c
--- a/blackbox/main.c	Sat Dec 10 16:37:55 2011 +0100
+++ b/blackbox/main.c	Sat Dec 10 17:12:47 2011 +0100
@@ -26,8 +26,9 @@
 } u32;
 
 #define FUEL_FULL       10000
-#define FUEL_DIVISOR    25
-//#define FUEL_DIVISOR    10
+#define FUEL_DIV_DEFAULT 25
+volatile uint8_t fuel_divisor = FUEL_DIV_DEFAULT; // default, can be set via serial command
+
 typedef struct {
     unsigned speedlimit:4; // 4bits speedlimit
     unsigned speedminimum:4; // 4bits speedminimum
@@ -204,6 +205,20 @@
 
                 case 'F': // set fuel enabled
                     fuel_enabled = buffer[1]-'0';
+                    if (buffer[2] == ':') {
+                        // convert fuel divisor
+                        buffer[0] = '0'; // atoi expects zeros!
+                        buffer[1] = '0';
+                        buffer[2] = '0';
+                        RS232_puts("DivisorChange: ");
+                        itoa(fuel_divisor, s, 10);
+                        RS232_puts(s);
+                        RS232_putc('>');
+                        fuel_divisor = atoi(buffer);
+                        itoa(fuel_divisor, s, 10);
+                        RS232_puts(s);
+                        RS232_putc(' ');
+                    }
                     RS232_puts_p(ok);
                     break;
 
@@ -334,7 +349,7 @@
         if (fuel_enabled) {
             if (speed != 0) {
                 // do the fuel calculation, regardless if fuel logic active or not
-                tmp = (uint8_t)(((slot[controller].accel * speed) + 1) / FUEL_DIVISOR);
+                tmp = (uint8_t)(((slot[controller].accel * speed) + 1) / fuel_divisor);
                 if (tmp == 0) tmp = 1;
                 if (slot[controller].fuel > 0) {
                     // enough fuel left to decrement?
@@ -349,6 +364,7 @@
             }
             return 1;
         }
+        return 1;
     } else return 0;
 }