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Old 04-29-2020, 01:59 PM   #14 (permalink)
Tahoe_Hybrid
Master EcoModder
 
Join Date: May 2019
Location: California
Posts: 374

Tahoe 2020 - '08 Chevy Tahoe H
90 day: 20.75 mpg (US)
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Quote:
Originally Posted by rmay635703 View Post
Thing is higher octane does not necessarily increase economy.
Not if the higher octane is running on summer fuel it's easy to tell if the 91/93 is on summer fuel still as the price will be 20/30 cents more then 87 octane


i.e 87 is 2.599 gallon while 89 and 91 is 2.799/2.899

summer fuel normally nets 2-3mpg more then winter fuel..

example Costs;

(city/highway)
2.599 18.5MPG
0.1404864864864865/miles

91octane 23mpg city
2.899
0.1260434782608696

27-31.2MPG
0.107 to 0.092 per mile.

would you rather pay more up front OR pay more per mile?

using 87 octane cost $3.22 per 23 miles in the city per gallon
using 87 octane costs 3.78-4.36 on the highway per gallon



18.5 is the confirmed mpg which others get with "87 octane"

Last edited by Tahoe_Hybrid; 04-29-2020 at 02:08 PM..
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