Here is a list of the highest earning events in Forza Motorsport 3. Run these if you want to make some credits to buy a new car or tune your current ones. Note that some events are much longer than others, so it's best to find events that have good rewards but also don't require 10 or more laps.
- Class R1 World Championship - 428,000
- Class R2 World Championship - 314,000
- Class R3 World Championship - 216,000
- Class S World Championship - 157,000
- Class R1 World Tour - 133,000
- Class R2 World Tour - 126,000
- GT1 Invitational - 119,000
- Japanese GT Invitational - 119,000
- Dream Match Invitational - 117,000
- Class R3 World Tour - 116,000
- LMP Invitational - 116,000
- GT2 Invitational - 116,000
- Class A World Tour - 115,000
- Class S World Tour - 114,000
- Porsche 911 GT3 Showdown - 111,000
- Aussie Touring Car Showdown - 111,000
- 187 KMS Nordschleife - 110,000
- 17 Laps Circuit de la Sarthe - 110,000
- 128 Miles Road America - 110,000
- Class B World Tour - 110,000
- German Racing Car Showdown - 110,000
- GT3 Invitational - 109,000
- American GT3 Invitational - 109,000
- Class A World Championship - 106,000
- FXX Trophy - 101,000
- Class C World Tour - 100,000
- 31 Laps Sebring Intl Raceway - 99,000
- Class D World Tour - 99,000
- Murcielago LP640 Trophy - 95,000
- 169 KMS Suzuka Circuit - 92,000
- 32 Laps Mugello - 92,000
- F355 Challenge Trophy - 91,000
- Ferrari F430 Trophy - 90,000
- 160 KMS Silverstone GP - 88,000
- Class E World Tour - 88,000
- Porsche 911 GT3 Trophy - 85,000
- Class F World Tour - 84,000
- 134 KMS Twin Ring Motegi - 83,000
- Hyundai Genesis Coupe Tour - 83,000
- Class B World Championship - 82,000
- MINI John Cooper Works Cup - 82,000
- ABARTH 500 ESSEESSE Trophy - 79,000
- 130 KMS Circuit de Catalunya - 74,000
- 34 Laps Road Atlanta - 72,000
- MX-5 Miata Trophy - 72,000
- Yaris S Trophy - 68,800
- Class R1 North America Tour - 66,000
- Class R2 North America Tour - 64,000
- Class R3 North America Tour - 63,000
- Class R1 Euro Tour - 63,000
- Class R2 Asian Tour - 61,000
- Class R2 Euro Tour - 59,000
- Class C World Championship - 58,000
- Class S North America Tour - 58,000
- Class S Asian Tour - 58,000
- Class A North America Tour - 56,000
- The K&N 700HP Challenge - 55,800
- MOTUL 600HP Run Off - 55,800
- STOPTECH 450HP Run-Off - 54,900
- Class R3 Euro Tour - 54,800
- BBS 400HP Run-Off - 54,500
- Class A Euro Tour - 53,800
- Class S Euro Tour - 53,700
- Class B North America Tour - 53,000
- Class B Asian Tour - 52,000
- BRIDGESTONE 500HP Run-Off - 50,700
- Class C Asian Tour - 49,400
- TOYO 300HP Run-Off - 49,300
- Class C Euro Tour - 49,200
- SPARCO 350HP Run-Off - 48,900
- Class B Euro Tour - 47,900
- Class D Post-'00 Asian Tour - 47,400
- Class C North America Tour - 47,200
- Class D North America Tour - 46,900
- Class D Pre-'00 Asian Tour - 46,500
- BILSTEIN 250HP Run-Off - 46,500
- Class E Post-'03 Asian Tour - 45,800
- Class E Pre'03 Asian Tour - 45,200
- Class D Euro Tour - 45,000
- RECARO 200HP Run-Off - 44,800
- Class F North America Tour - 44,700
- Class E North America Tour - 44,000
- Class E Euro Tour - 43,400
- Class F Post-'00 Asian Tour - 43,400
- PUMA 150HP Run-Off - 42,700
- Class F Pre-'00 Asian Tour - 41,600
- Class F Euro Tour - 41,000
- Fujimi Kaido Class C Series - 39,300
- Fujimi Kaido Class S Series - 39,000
- Fujimi Kaido Class R1 Series - 38,700
- Nurburgring Class R2 Series - 38,400
- Nurburgring Class A Series - 38,400
- Nurburgring Class D Series - 38,400
- Fujimi Kaido Class F Series - 38,400
- Class D World Championship - 36,600
- Class R2 Super Lap Days - 34,500
- Class A Super Lap Days - 34,500
- Class B Super Lap Days - 34,500
- Class D Super Lap Days - 34,500
- Class E Super Lap Days - 34,500
- Class R1 Super Lap Days - 34,400
- Class R3 Super Lap Days - 34,400
- Class S Super Lap Days - 34,400
- Class C Super Lap Days - 34,400
- Class F Super Lap Days - 34,400
- Amalfi Class B Series - 29,100
- Amalfi Class E Series - 29,100
- Amalfi Class R3 Series - 27,900
- Class R1 Speedway Challenge - 27,400
- Fastest Fleet Shoot-Out - 27,100
- Porsche Club - 26,600
- Lamborghini vs. Ferrari - 26,500
- Viper Track Days - 26,400
- Chevrolet Track Days - 26,400
- Ultimate Speed Shoot-Out - 26,200
- Corvette Track Days - 26,000
- Class R2 Speedway Challenge - 25,900
- Dodge Track Days - 25,900
- Ferrari vs. Porsche - 25,800
- German Sport-Line Challenge - 25,800
- Mercedes-Benz Owner's Club - 25,800
- Audi Club - 25,800
- Class R3 Speedway Challenge - 25,700
- Premium Sedan Shoot-Out - 25,100
- NSX vs. Skyline - 24,900
- Nissan Infiniti Owner's Club - 24,300
- Vauxhall Racing Club - 24,200
- Mustang Track Days - 24,100
- Honda Acura Owner's Meeting - 24,100
- Class E World Championship - 23,900
- Lotus Club - 23,900
- Prestigious Coupe Shoot-Out - 23,800
- Ford Track Days - 23,800
- Mazda Owner's Meeting - 23,800
- Class S Speedway Challenge - 23,700
- Toyota Lexus Owner's Meeting - 23,700
- Class A Speedway Challenge - 23,500
- Speedster Shoot-Out - 23,500
- Pontiac Track Days - 23,500
- Skyline Owner's Meeting - 23,400
- Chrysler Track Days - 23,300
- SEAT Club - 23,300
- Fairlady Z Cup - 23,300
- BMW Owner's Club - 22,900
- Integra Owner's Meeting - 22,900
- Mustang vs. Camaro - 22,800
- Mitsubishi Owner's Meeting - 22,700
- Supra vs. Fairlady Z - 22,600
- Class B Speedway Challenge - 22,500
- Lightweight Sports Showdown - 22,500
- Germany SUV Shoot-Out - 22,400
- Firebird Trans Am Track Days - 22,400
- Tarmac Rally - 22,300
- Celica vs. Silvia - 22,300
- V-Dub Club - 22,300
- Sweden Club - 22,200
- Civic vs. Golf - 22,100
- Focus Track Days - 22,000
- JDM Imports 90's Shoot-Out - 21,800
- Subaru Owner's Meeting - 21,500
- Class C Speedway Challenge - 21,400
- Euro Hatch Shoot-Out - 21,400
- Hyundai Owner's Meeting - 21,100
- Class D Speedway Challenge - 20,600
- Peugeot Racing Club - 20,600
- World Sub-Compact Shoot-Out - 20,500
- American Muscle Shoot-Out - 20,100
- Class E Speedway Challenge - 19,400
- Class F Speedway Challenge - 18,600
- Class F World Championship - 18,200
- Prototype Road Test - 16,100
- Italian Elite Open - 15,800
- Supercar Road Test - 15,400
- British Elite Invitational - 15,100
- Ten-Cylinder Salute - 15,000
- Saloon Road Test 2 - 14,600
- German Elite Invitational - 14,600
- 12-Cylinder Flagship Trophy - 14,300
- Executive Car Open - 14,300
- AWD Elite Open - 14,100
- Coupe Road Test 2 - 13,800
- Eight-Cylinder Supreme GT - 13,600
- Boosted Proving Grounds - 13,500
- Coupe Road Test 1 - 13,300
- Coupe Road Test 3 - 13,200
- Ultralight Showdown - 13,100
- Hot Hatch Road Test - 13,100
- North American Elite Open - 13,100
- FWD Elite Open - 12,900
- Six-Cylinder Fast & Fun - 12,700
- SUV Road Test - 12,700
- RWD Elite Open - 12,700
- Normal Aspiration Run-Off - 12,500
- Asian Elite Open - 12,400
- French Elite Invitational - 12,000
- Saloon Road Test 1 - 11,700
- Mid-Engine Elite Open - 11,600
- Super Mini Road Test - 11,500
- Inline 4 Showcase - 11,400
- American Muscle Showdown - 11,100
- Five-Door Challenge - 6,800
- Four-Door Challenge - 6,800
- Three-Door Challenge - 6,800
- Two-Door Challenge - 6,800
- AWD Open - 6,600
- RWD Open - 6,600
- FWD Open - 6,600
- All-American Open - 6,600
- European Open - 6,600
- Asian Open - 6,600
- 700HP RWD Shoot-Out - 2,700
- 650HP RWD Shoot-Out - 2,700
- 600HP AWD Shoot-Out - 2,700
- 550HP AWD Shoot-Out - 2,700
- 500HP AWD Shoot-Out - 2,700
- 450HP RWD Shoot-Out - 2,700
- 350HP RWD Shoot-Out - 1,890
- 300HP FWD Shoot-Out - 1,890
- 250HP FWD Shoot-Out - 1,890