Originally Posted by
Daox
I would say the LRR tires are good for 2-3 mpg gain, the alternator delete is good for about the same.
That's still too optimistic, I'm afraid. A gallon of petrol equals to about 9.45kWh. (Still 10kWh/L, engine efficiency 25%). So a car on 50mpg runs 50m/9.45kWh, which equals 0.189kWh/mile. To gain 2mpg, that has to be 4% lower, which is 0.0076kWh/mile = 7.6Wh/mile, which is 0.63Ah/mile at 12V.
Your average speed is 28miles/h, so the saved current should be 17.6A. But you wrote the car uses about 8A. (4Ah in half an hour), which is less than a half, so the gain is less than 1mpg.
Maybe the car uses 17.6A with headlights on. In that case 2mpg could be gained, if you charge the battery from another source. Charging from regeneration is unrealistic, as you should be regenerating at 100A for about 20% of the time.
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View my fuel log 2013 Space Star Cleartec Intense 1.0 manual: 55.7 mpg (US) ... 23.7 km/L ... 4.2 L/100 km ... 66.9 mpg (Imp)