E85 vs. 93 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

GCguy2169 · 02-27-2019, 11:15 PM

I just wanted to ask around..

I run strictly E85 since I've been tunes with the DSX kit I had installed. Obviously, gas mileage is horrible now but the E85 definitely improves power.

With that said, has anyone ever alternated use between 93 and e85? Are there any benefits to alternating use? Downsides?

Main reason to ask, is if I've got a busy day and am using the Camaro I can easily use 1/2 tank on e85 very very quickly and I feel I'm actually spending tons on gas during the weekends despite the cheaper price.

Just curiosity questions!

If this helps:

2010 Camaro 2SS - Inferno Orange Metallic - 6 Speed Manual

Current Mods:

Vararam Tunable Intake

Corsa Extreme Catback Exhaust System

Kooks Longtube 1-7/8 in. Headers

Kooks Off-road Downpipes

RX Ported and Polished Throttle Body

RX Catch Can*

Flex Fuel Sensor Swap - E-85 Fuel Use

Custom Tuned (Dynojet)

Accel Ceramic Plug Wires

BMR Suspension - Front and Rear Sway Bars, Trailing Arms, Derlin Differential Bushings*

ZL1 Add-ons Wicker Bill*

GM Dovetail Spolier

Ceramic Tint

Rydeskinz Custom Front Bumper, Razzi Skirts, Rear Diffuser

VIS Motorsports Carbon Fiber Hood*

MRR 228 Wheels*

Bridgestone Comp G 285/20/35 Front - 305/20/35 Rear*

Mileage: 41, XXX

Oil - Pennzoil Ultra Platinum

Brian Tooley Racing Stage 4 Camshaft

ATI Super Damper*

Melling Oil Pump

Injector Dynamics ID850s

Sent from my SM-G965U using Tapatalk

gm2376 · 02-28-2019, 08:10 AM

what are you tuned for? if you have a straight e85 tune then no.....if you have a flex tune, then mix all you want and it will adjust.

GCguy2169 · 02-28-2019, 09:01 AM

I am tuned for all. I run E85. I was looking for some insight for a little education.

Sent from my SM-G965U using Tapatalk

DRKS1D3 · 02-28-2019, 09:36 AM

The benefit of alternating back and forth between 93 and E85 is that you're going to spend less on fuel than if you ran E85 all of the time. E85 has a higher octane rating because it consists of 85% ethanol vs. 93 octane having the standard 10% ethanol mixture (or at some gas stations, 0% ethanol). If you're tuned for both, run 93 on the street and fill up with E85 before hitting the strip.

Livernois Motorsports · 02-28-2019, 10:13 AM

I'll be honest depending on the price it usually equals out for me. Here in Michigan we usually see 1.70$ on average cheaper then 93 and you use 40% more fuel so it is almost a even trade here. Now as for plus side is on my flex tune I like running e85 spring through fall and then once it gets chilly I switch back to 93 to keep from rough cold starts. Also when it gets stored for the next 4 months of winter it is better to have 93 in then e85.

silversleeper · 02-28-2019, 11:20 AM

Sometimes for economy what I'll do is mix some e85 as low cost effective octane booster to cheap 87 low octane for better mpg and price.
5gal of 108 octane e85 plus 15gal of 87 octane gives you 92 octane cheaply and mpg won't be more than 5-10% lower than straight 93 or 91 pump gas.

02-27-2019, 11:15 PM	#1
GCguy2169 Drives: 2010 Camaro SS Join Date: Jul 2008 Location: Grove City, Ohio Posts: 76 View My Garage	E85 vs. 93 I just wanted to ask around.. I run strictly E85 since I've been tunes with the DSX kit I had installed. Obviously, gas mileage is horrible now but the E85 definitely improves power. With that said, has anyone ever alternated use between 93 and e85? Are there any benefits to alternating use? Downsides? Main reason to ask, is if I've got a busy day and am using the Camaro I can easily use 1/2 tank on e85 very very quickly and I feel I'm actually spending tons on gas during the weekends despite the cheaper price. Just curiosity questions! If this helps: 2010 Camaro 2SS - Inferno Orange Metallic - 6 Speed Manual Current Mods: Vararam Tunable Intake Corsa Extreme Catback Exhaust System Kooks Longtube 1-7/8 in. Headers Kooks Off-road Downpipes RX Ported and Polished Throttle Body RX Catch Can* Flex Fuel Sensor Swap - E-85 Fuel Use Custom Tuned (Dynojet) Accel Ceramic Plug Wires BMR Suspension - Front and Rear Sway Bars, Trailing Arms, Derlin Differential Bushings* ZL1 Add-ons Wicker Bill* GM Dovetail Spolier Ceramic Tint Rydeskinz Custom Front Bumper, Razzi Skirts, Rear Diffuser VIS Motorsports Carbon Fiber Hood* MRR 228 Wheels* Bridgestone Comp G 285/20/35 Front - 305/20/35 Rear* Mileage: 41, XXX Oil - Pennzoil Ultra Platinum Brian Tooley Racing Stage 4 Camshaft ATI Super Damper* Melling Oil Pump Injector Dynamics ID850s Sent from my SM-G965U using Tapatalk __________________ 2010 Inferno Orange Metallic 2SS/RS - 6 Speed Manual -BTR Stage 4 Cam, ID850 Injectors, E-85 Tuned, Corsa Xtreme Exhaust , Kooks 1 7/8 Headers, Melling Performance Oil Pump, ATI Super Damper, BMR Suspension: Sway Bars, Trailing Arms, 1” Lowering Springs, Differential Bushings, Rx Ported and Polished Throttle Body, VIS Racing Carbon Fiber Hood, Custom Painted - Body Kit, Entire Vehicle, ZL1 Addons Wicker Bill, MRR 20” Wheels, Powerstop Brakes, Koni SRT.T Shocks and Struts

02-28-2019, 08:10 AM	#2
gm2376 Drives: 2010 Black 2ss Camaro SS Join Date: May 2010 Location: Rochester Hills, MI Posts: 1,062	what are you tuned for? if you have a straight e85 tune then no.....if you have a flex tune, then mix all you want and it will adjust. __________________ ZL1 10 spokes,Dart 388,ECS Supercharger 2200x, E85 Flex Fuel sensor, Dart 388 , B&M Tranny Cooler, Vigilante 4000 Triple Disc TC,Katech Ported Heads, Texas Speed Sheet Metal Intake, ECS Big Blower Cam,ID 1700s, Fore Triple Pumps, E85,ATI Super Dampner, KW V3 Coilovers, Pfadt front and rear sway bars,Pfadt Trailing arms and toe rods,ZL1 Rear Diff, RPM 6l90e level 10 Tranny, SW Long Tubes no cats,Nick Williams Boosted 102mm TB, Dr Phil Tune,Borla Atak

02-28-2019, 09:01 AM	#3
GCguy2169 Drives: 2010 Camaro SS Join Date: Jul 2008 Location: Grove City, Ohio Posts: 76 View My Garage	I am tuned for all. I run E85. I was looking for some insight for a little education. Sent from my SM-G965U using Tapatalk __________________ 2010 Inferno Orange Metallic 2SS/RS - 6 Speed Manual -BTR Stage 4 Cam, ID850 Injectors, E-85 Tuned, Corsa Xtreme Exhaust , Kooks 1 7/8 Headers, Melling Performance Oil Pump, ATI Super Damper, BMR Suspension: Sway Bars, Trailing Arms, 1” Lowering Springs, Differential Bushings, Rx Ported and Polished Throttle Body, VIS Racing Carbon Fiber Hood, Custom Painted - Body Kit, Entire Vehicle, ZL1 Addons Wicker Bill, MRR 20” Wheels, Powerstop Brakes, Koni SRT.T Shocks and Struts

02-28-2019, 09:36 AM	#4
DRKS1D3 Drives: '17 Corvette Grand Sport M7 Join Date: May 2012 Location: Pennsylvania Posts: 3,748	The benefit of alternating back and forth between 93 and E85 is that you're going to spend less on fuel than if you ran E85 all of the time. E85 has a higher octane rating because it consists of 85% ethanol vs. 93 octane having the standard 10% ethanol mixture (or at some gas stations, 0% ethanol). If you're tuned for both, run 93 on the street and fill up with E85 before hitting the strip. __________________ MY RIDE: 2017 CORVETTE GRAND SPORT--TRIPLE BLACK, 7 SPEED MANUAL, VARARAM TCR-7 INTAKE, BORLA CATLESS X-PIPE, CARBON FIBER STAGE 2 AERO, MGW SHORT-THROW SHIFTER SOLD2011 TRIPLE BLACK SS CONVERTIBLE--6 SPEED MANUAL, MANY MODS, 455 RWHP/435 RWTQ DAD'S RIDE: 2012 ZL1 #1866--BLACK, 6 SPEED MANUAL, EXPOSED CF HOOD, POLISHED WHEELS, SUNROOF, ROTO-FAB INTAKE "Silly Americans, taking from the rich and giving to the poor only works in fairy tales. Success is earned here!".

02-28-2019, 10:13 AM	#5
Livernois Motorsports Drives: 2010 Camaro 454 LSX (SOLD) Join Date: Jun 2013 Location: Dearborn Heights, MI Posts: 792	I'll be honest depending on the price it usually equals out for me. Here in Michigan we usually see 1.70$ on average cheaper then 93 and you use 40% more fuel so it is almost a even trade here. Now as for plus side is on my flex tune I like running e85 spring through fall and then once it gets chilly I switch back to 93 to keep from rough cold starts. Also when it gets stored for the next 4 months of winter it is better to have 93 in then e85.

02-28-2019, 11:20 AM	#6
silversleeper Big Crow Drives: '13 ZL1 Join Date: Mar 2017 Location: California Posts: 1,486	Sometimes for economy what I'll do is mix some e85 as low cost effective octane booster to cheap 87 low octane for better mpg and price. 5gal of 108 octane e85 plus 15gal of 87 octane gives you 92 octane cheaply and mpg won't be more than 5-10% lower than straight 93 or 91 pump gas.