Gas tank and mpg

[Amp653]

my 2011 PPV is seeing an average of 15mpg overall full to empty. When I fill it up with light on it stops at 23 gallons
1) did these suvs use smaller tanks
2) shouldn’t I be seeing better mpg?

I highway drive most of time. 90 miles round trip a day. Standard regular 87 octane on eagle RS-A and stock 17” cop wheels

 

[captain howdy]

Sounds about right to me

 

[wjburken]

I believe your Tahoe has a 26 gallon tank so having 3 gallons left makes sense. Light typically comes on when it calculates your 45-60 miles from empty. At 15 mpg, 45 miles is 3 gallons.

Not sure when you typically fill up, but I would recommend not waiting for the low fuel light to come on before refilling. It can be tough on your fuel pump as it uses the fuel to help keep it cool.

 

[Sparksalot]

my 2011 PPV is seeing an average of 15mpg overall full to empty. When I fill it up with light on it stops at 23 gallons
1) did these suvs use smaller tanks
2) shouldn’t I be seeing better mpg?

I highway drive most of time. 90 miles round trip a day. Standard regular 87 octane on eagle RS-A and stock 17” cop wheels

That’s about what I get from theothertwin. In thecopcar I’m lucky to get 13, but it has my camping gear and an 11 gallon water tank onboard as well.

 

[swathdiver]

my 2011 PPV is seeing an average of 15mpg overall full to empty. When I fill it up with light on it stops at 23 gallons
1) did these suvs use smaller tanks
2) shouldn’t I be seeing better mpg?

I highway drive most of time. 90 miles round trip a day. Standard regular 87 octane on eagle RS-A and stock 17” cop wheels

Run better fuel, get better results. Run a couple of tanks of top tier 93 from Chevron and watch what happens.

 

[Amp653]

View attachment 361871

Run better fuel, get better results. Run a couple of tanks of top tier 93 from Chevron and watch what happens.

Thank you for this. I thought about doing this. But I’m new to the Chevy line up always been a ford guy. Motor is top notch all the necessary work has been done. So I think maybe a small Change like this may give me what I’m looking for. It just surprised me a bit averaging 15mpg rather than low end.

 

[swathdiver]

Thank you for this. I thought about doing this. But I’m new to the Chevy line up always been a ford guy. Motor is top notch all the necessary work has been done. So I think maybe a small Change like this may give me what I’m looking for. It just surprised me a bit averaging 15mpg rather than low end.

Check the alignment, not just to see if it is in the green but set up properly and also check the condition of the tires. Some tires deliver terrible mileage but have other positive attributes. Mine is so bad that the EPA didn't even bother to rate it!

 

[Fless]

View attachment 361871

Run better fuel, get better results. Run a couple of tanks of top tier 93 from Chevron and watch what happens.

My NBS runs very similar to this, re the low fuel light. When it comes on, there's between 4 and 5 gallons in the tank. Of course, this could vary by the design of the fuel module (pump) sender, when the light is commanded on.

 

[iLikeEggs]

My 2011 SSV with a recent new motor and trans, michelin defender LTX load range E's at 60 psi will give me 20 hwy and 13 city. Sometimes city is a bit better after I disconnect the batteries for a computer relearn or dump some Berryman's in the tank. Cleaning the air temp sensor can help too.

 

[tom3]

I'd also try a higher grade gas for a few tanks. These motors have pretty high compression and the ECM might be pulling some timing with regular. Take a look at the air filter too.

 

[CaptainAmerica1]

I think most agree that 89 octane is the sweet spot for these trucks. When I run 89/91 I get an average of 16mpg. E85 I get 12. I only drive short trips in the city with four 20 mile highway trips a month. My gf is 9 miles away in stop and go traffic. Grocery store is 3 miles from me. I work 100% remote. I leave my apartment 2-3 times a week for beer runs and cigars.

 

[BG1988]

my 2011 PPV is seeing an average of 15mpg overall full to empty. When I fill it up with light on it stops at 23 gallons
1) did these suvs use smaller tanks
2) shouldn’t I be seeing better mpg?

I highway drive most of time. 90 miles round trip a day. Standard regular 87 octane on eagle RS-A and stock 17” cop wheels

pretty good i'm getting 18-21 around town 27 on the highway using a transmission glitch with the AFM module the glitch keeps it in EVT mode for longer time it has a infinity gear ratio it uses Sun and planet gears


I got some more Aero mods planned so i can get the mpg into the 35-40-mpg range on the highway

 

[Fless]

pretty good i'm getting 18-21 around town 27 on the highway using a transmission glitch with the AFM module the glitch keeps it in EVT mode for longer time it has a infinity gear ratio it uses Sun and planet gears


I got some more Aero mods planned so i can get the mpg into the 35-40-mpg range on the highway

HYBRID ALERT

 

[BG1988]

HYBRID ALERT

hey saves $$$
imagine getting 13 mpg and paying 6$ a gallon because of your horribly inefficient 4L65-E transmission...

when that shit is on the Highway it's GAS mode 100% of the time and in V8 mode only so the savings are at the transmission the electrical motors are pretty much doing nothing as the HV battery is completely spent, 14 years old ....

it's in the special 3rd mode (engine speed pegged at 1,000-1500 rpm) where the engine spins the electrical motor then spins the second motor which spins the drive shaft then wheels

if it had a brand new battery i would be easily doing 32-35mpg on the highway using the special 3rd mode...

 

[Fless]

hey saves $$$
imagine getting 13 mpg and paying 6$ a gallon because of your horribly inefficient 4L65-E transmission...

when that shit is on the Highway it's GAS mode 100% of the time and in V8 mode only so the savings are at the transmission the electrical motors are pretty much doing nothing as the HV battery is completely spent, 14 years old ....

it's in the special 3rd mode (engine speed pegged at 1,000-1500 rpm) where the engine spins the electrical motor then spins the second motor which spins the drive shaft then wheels

if it had a brand new battery i would be easily doing 32-35mpg on the highway using the special 3rd mode...

Cool, get a replacement battery with the $$ saved on gas!