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<blockquote data-quote="IrTehL33T@DBeez" data-source="post: 2028729" data-attributes="member: 568276">theres no need to get complicated, its just a matter of if the engine in the vehicle of choice uses constant ratio of fuel throughout rpm range. if you were to look at the fuel mapping, determine rpm points at which each speed will match with in top gear, along with the same load input, you can determine how much fuel is being consumed and then use that quantity to go take into consideration with the time difference.some fuel maps are rather rich in the lower rpms which could actually mean that in a high geared 5th or 6th at 65, you&#039;re revving so low that you would actually lean out a little bit by accelerating to 80 and getting the revs up to a leaner a/f ratio, and possibly require less of&nbsp; a load to maintain speed because of powerband... in which case the fuel consumption may actually decrease.its all going to depend on the specific vehicle&#039;s tuning data and its gear ratiosalthough, this entire theory doesn deplete the consideration of drag coefficient, it would have to be considered an idealistic theoretical calculation</blockquote>

[QUOTE="IrTehL33T@DBeez, post: 2028729, member: 568276"] theres no need to get complicated, its just a matter of if the engine in the vehicle of choice uses constant ratio of fuel throughout rpm range. if you were to look at the fuel mapping, determine rpm points at which each speed will match with in top gear, along with the same load input, you can determine how much fuel is being consumed and then use that quantity to go take into consideration with the time difference. some fuel maps are rather rich in the lower rpms which could actually mean that in a high geared 5th or 6th at 65, you're revving so low that you would actually lean out a little bit by accelerating to 80 and getting the revs up to a leaner a/f ratio, and possibly require less of a load to maintain speed because of powerband... in which case the fuel consumption may actually decrease. its all going to depend on the specific vehicle's tuning data and its gear ratios although, this entire theory doesn deplete the consideration of drag coefficient, it would have to be considered an idealistic theoretical calculation [/QUOTE]

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