When i filled up today i thought about my speedo being off because of my 33'' tires. This affects the odometer also. SOOOO that being said i went 280 miles and used 22.22 gallons thats 280 miles with the odometer being off..... What would my real mileage be?

 

I get 220 miles to 26 gallons lol

 

31 inch tires

 

Yes. Only if the 280 miles is accurate. If it is based on your odoemeter that is off, then no.

 

Stock tire size is 225/75/r15 which are 29'' I have 33''. ODOMOTER said 280. 20 goes into 280 14 times the diffrenece between Speedo reading and "Actual Distance traveled" is 2.55x14=35.7 Miles traveled PLUS the 280 that equals 315.7 then divide that by the 22.22 gallons i used and its 14.2. Does this seem correct? If so im pleased with that because that was with me messing around a little. This chart is my stock size tires VS. My size tires.
Speedo Reading Actual Speed
20 mph (32.19 km/h) 22.55 mph (36.3 km/h)
25 mph (40.23 km/h) 28.19 mph (45.37 km/h)
30 mph (48.28 km/h) 33.83 mph (54.45 km/h)
35 mph (56.33 km/h) 39.47 mph (63.52 km/h)
40 mph (64.37 km/h) 45.11 mph (72.6 km/h)
45 mph (72.42 km/h) 50.75 mph (81.67 km/h)
50 mph (80.47 km/h) 56.39 mph (90.75 km/h)
55 mph (88.51 km/h) 62.03 mph (99.82 km/h)
60 mph (96.56 km/h) 67.66 mph (108.89 km/h)
65 mph (104.61 km/h) 73.3 mph (117.97 km/h)

 

I just got back from the gas station, I got 250.2 mi on 21.64gallons. That's running 285/75 16 with my speedo calibrated to 275/75 16

 

I always go off the odometer when I calculate mine even though it is off due to tire size... 315/75R16 vs stock 245/75R16 I think?

anyway calculating based off odo I get like 12-15 depending on how nice I drive. sometimes in the summer if I can manage to not push the skinny pedal past 1/8th to 1/4 throttle, I can get 17mpg.. its very hard to not want to push it down and hear those twins spool though. I dunno how people do it! I've had twins for over a year and it never gets old hearing that sound!