2024 Tiffin Allegro 34PA vs 2025 Newmar London Aire 4551

Shopping for an RV and torn between the 2024 Tiffin Allegro 34PA and the 2025 Newmar London Aire 4551? We've put together a detailed spec comparison to help you decide.

Specifications Comparison

Specification2024 Tiffin Allegro 34PA2025 Newmar London Aire 4551Advantage
CategoryClass AClass A
Year202420252025 Newmar London Aire 4551
Length40 ft35.5 ft
Width8 ft8.5 ft
Height12 ft11 ft
Dry Weight33,200 lbs17,700 lbs
GVWR38,000 lbs19,800 lbs
Sleeping Capacity542024 Tiffin Allegro 34PA
Fresh Water86 gal73 gal2024 Tiffin Allegro 34PA
Gray Water80 gal72 gal2024 Tiffin Allegro 34PA
Black Water44 gal43 gal2024 Tiffin Allegro 34PA
Fuel Capacity123 gal114 gal2024 Tiffin Allegro 34PA
Horsepower322 hp355 hp2025 Newmar London Aire 4551
EngineChevrolet 6.0L V8Chevrolet 6.0L V8
Slide-Outs142025 Newmar London Aire 4551
Solar500 W200 W2024 Tiffin Allegro 34PA
Battery200 Ah250 Ah2025 Newmar London Aire 4551
Inverter3,000 W1,500 W2024 Tiffin Allegro 34PA
MSRP$356,000$359,0002024 Tiffin Allegro 34PA

Detailed Comparison

Shopping for an RV and torn between the 2024 Tiffin Allegro 34PA and the 2025 Newmar London Aire 4551? We've put together a detailed spec comparison to help you decide.

Dimensionally, you're looking at 40.0 ft for the Tiffin Allegro 34PA and 35.5 ft for the Newmar London Aire 4551. The Tiffin Allegro 34PA carries an extra 15,500 lbs, which affects tow vehicle requirements and fuel economy.

Capacity-wise, expect to sleep 5 in the Tiffin Allegro 34PA versus 4 in the Newmar London Aire 4551. With 1 and 4 slide-outs respectively, the parked floor plans differ significantly.

Tank capacities are a key off-grid consideration. The Tiffin Allegro 34PA carries 86 gal of fresh water, 80 gal gray, and 44 gal black. The Newmar London Aire 4551 offers 73 gal fresh, 72 gal gray, and 43 gal black. The Tiffin Allegro 34PA has the edge for extended dry camping.

Budget-wise, the Tiffin Allegro 34PA is listed at $356,000 compared to $359,000 for the Newmar London Aire 4551.

For boondocking, the model with superior solar and battery setup will keep you comfortable off the grid longer. If you're going full-time, the larger tanks and more robust build quality matter enormously.

Whichever you choose, you'll be getting a capable rig. Just make sure to inspect one in person before signing.

Individual Overviews

2024 Tiffin Allegro 34PA

  • Category: Class A
  • Length: 40 ft
  • Weight: 33,200 lbs
  • Sleeps: 5
  • MSRP: $356,000
View Full Specs

2025 Newmar London Aire 4551

  • Category: Class A
  • Length: 35.5 ft
  • Weight: 17,700 lbs
  • Sleeps: 4
  • MSRP: $359,000
View Full Specs